I have no desire to argue with anyone.  I asked my father about legwear as it was in his childhood.  He was born in 1925 in New York City.  Do the math.  Acording to Dad, who does NOT suffer from dementia, it was universal custom for little boys up until about age 2, to wear gowns.  This allowed for ease and modesty of diaper changes and early potty training.  No boy ever admitted to remembering wearing a gown!  From age 2 on up to about 7 or 8, long shorts and knee socks were worn in hot weather and knickers with argyle knee socks the rest of the time.  By about 10, shorts were worn only for things like hiking or Boy Scout Camp.  It was a hallmark of entering manhood to wear long pants full time.  My Dad recalls the knickers vanishing between grades 7 and 8. No boy would be caught dead in knickers or shorts in high school unless it was to play team sports.  And even then, they were baggy, not form-fitting like today's spandex.  
I don't see any older boys or men wearing shorts in the sspx school picture.  If anything, the boys have less leg showing than the girls.  And remember, it is a school in Florida, not Minnesota!  The shorts are not form fitting.  Personally, I think many trads. are Puritanical.  I'd be much more concerned over the doctrine my child will be taught at the school than over little boys in long, loose shorts!  
Could a case not be made over the length of the girls' sleeves?  Mary-like standards call for long sleeves, or at least no shorter than half way up the forearm to the elbow.  Pope Pius XI conceded half way to the elbow on the upper arm "due to market conditions."  How many SSPX chapels and schools enforce the more modest of the two?  
And shouldn't every child have his or her top buttoned to the neck?  
I teach in a private school K-8, that requires modest uniforms.  Boys through grade 2 (age 7-8), are permitted to wear the same type of shorts if the temperature is 70° F or above.  Unlike the sspx school, Polo shirts aren't allowed except for P.E.  All boys wear a light blue long or short sleeve dress shirt and tie on top.  Grades 6-8 must wear or have with them a suit jacket.  Younger boys may wear a suit jacket or cardigan.  Girls up through grade 2 wear a green, blue, gray plaid jumper with a blue long or short sleeve blouse, a Navy beret, and navy criss-cross neck tie.  After grade 2 they exchange the jumper for a pleated skirt with button-up vest.  Boys wear a Navy sweatsuit with Polo shirt and black, blue, or white sneakers for p.e.  Girls wear navy clothes, white knee socks, Polo shirt, and zip-up navy fleece jacket, + same choice in sneakers.  There are two styles of dress shoes for boys, three styles for girls.  There is an optional school hooded wind-breaker for all.  Teachers don't have a uniform, per se, but we do follow a set dress code.  My personal opinion?  We're an exceptionally well-dressed school.  

Well said, Alligator!

as for this
I'm pretty sure these men had never heard of let alone attended a Novus Ordo:
Now we might say "men look funnt in shorts, but to say it's Novus Ordo is an innane comment.

Indeed, they look rather ridiculous.  And, ladies, be sure to avert your eyes lest you be tempted ... to be grossed out.   

Wait a minute. This school is kindergarten to 8th grade. A 14 year old wouldn't be there.

Do your math again: 8th grade is 13-14 year-olds.

Indeed, they look rather ridiculous.  And, ladies, be sure to avert your eyes lest you be tempted ... to be grossed out.    

Grossed out?  In NY, I'd give them a second glance, concluding they were some sort of fruit and nut club,  but a third glance, no.  I'm grossed out only when people are wearing mainly tattoos and piercings instead of clothes, or when a super morbidly obese person squeezes him or herself into neon or animal print spandex!  Or if a person's lack of hygiene is what causes me to take notice.  Also, conduct not associated with human beings!  These things are truly gross!  
Five or six inches of little boys' legs?  No.

I was 12  in 8th grade. I could ask my mother but I don't recall skipping a grade. At any rate the kid's Summer uniform isn't scandalous. Those shorts don't go up to the thigh.  I just can't see getting hysterical about this.

The whole country is 12 in 6th grade.
And you are deliberately missing the point: They attend Mass in shorts!!

Babies attend Mass in diapers. Oh horror.  Should you not be thankful to be at Mass and  concern yourself with your own sins rather than obsess over what small children are wearing?

I have yet to see a baby in church clad in only a diaper, and if 14 year-olds qualify as “small children,” then you should have no problem dressing one for school and bathing on, eh?
Let me guess: You wear pants, makeup, watch tv, have a career, would attend an indult Mass, etc?

SSPX Sanford Florida St. Thomas More Chapel bulletin reads (every large letter or bolding is exactly as the bulletin is written:

“I URGE YOU THEREFORE, BROTHERS, BY THER MERCIES OF GOD, TO OFFER YOUR BODIES AS LIVING SACRIFICE, HOLY AND PLEASING TO GOD, YOUR SPIRITUAL WORSHIP.” Rm 12:1

Out of respect for Our Lord Jesus Christ and for the edification of our neighbor, we beg all to appear in Church decent in deportment and modest in dress.

However, no one has the right to question others, especially visitors. It belongs to the parish priest alone to instruct the laity when they repeatedly dress or deport below expectation.

For Gentlemen and lads: Neither shorts, T-shirts, nor sneakers meet the norms of modesty.

For ladies and girls: Neither shorts, slacks, sleeveless, short nor low cut dresses meet the norms of modesty.

Furthermore, according to apostolic custom or Church law, gentlemen are bareheaded in church; and ladies are requested to cover their heads.

Thank you for your charity.

The priests continue to bring the school children into mass in shorts. Yesterday there was a funeral mass and all the children were in shorts. The bulletin says no shorts even for lads, but it also says "It belongs to the parish priest alone to instruct the laity when they repeatedly dress or deport below expectation", so what happens when it is the priests who are instructing/ordering the people to  "repeatedly dress or deport below expectation"?