That comment from his brother, "Quit showing off, you little jerk." ... while it may seem flippant, it does lend some insight into Bob's character.

So, the fact that his older brother, who knows him very well, immediately felt that he was "showing off" ... that says something about his character, that they consider him a show-off.  If the man were a true "humble" man of the people as he's trying to be portrayed (like Jorge), then that expression "Quit showing off..." wouldn't really pop into your head.

To be fair, when was the last time the pope's brother spent a lot of time with him...as a teenager?  He entered the seminary fairly young.  Who isn't a show-off, as a teenager, especially around their siblings?

Yes it does.  I grew up as a boy with three brothers.  You're imposing female thinking of jealousy and/or "feeling inferior".  Stop babbling about a matter you have no competency in and then pontificating about it. 

I know how boys think and what the import of this comment is.  If you don't know a person's character, then switching to Spanish ... when you know the man speaks multiple languages and is more comfortable with Spanish than Italian, the expression about the "little jerk" is "showing off" doesn't simply pop into your head as your first gut reaction.  I thought nothing of it myself, thinking it natural.  If he really wanted to "show off", he would have done the Wojtyla and also used some English.  No, this speaks VOLUMES about how the brothers perceived him.

"Little jerk ..." is definitely a term of affection, but you need to put it in context.  His brothers knows very well that the guy is as fluent in Spanish as in English, having spent half his adult life there, and that he's less comfortable with Italian, so that when he puts the paper down with his written Italian comments and starts speaking off the cuff in the language he's most comfortable with, the last thing that pops in your head is that he's "showing off".  Now, you might actually be annoyed by his refusal to speak English ... trying to downplay being an American, the last thought that would ever occur to you would be that he's "showing off" with Spanish, unless there's something there, some history of his being a show-off or being arrogant.  Now, if he were doing the old Wojtyla where he probably spent 2 hours rehearsing saying "Merry Christmas" and "Happy Easter" in 50 different languages, yeah, you might think showing off.

There's something there where the first expression that pops into his head is that he's "showing off" by using the Spanish.  If my brother were giving a speech in some international context and he spoke first in English, then said a few words in Hungarian, the last thing that I'd think was that he's "showing off".  I'd think that he's trying to communicate with a mixed group of people.  When Leo was speaking, the entire world was watching on camera, and a huge percentage of the world's population speaks Spanish, so it's not the least bit remarkable that he would try to say a few words in Spanish.  What I find more remarkable is that he avoided saying anything in English.  I certainly would have, knowing that it's the most widely spoken language in the world, and as a tip of the hat to my native country.

So if any thought occurred to me about the languages, it would be the question of why he was avoiding English.

Yes it does.  I grew up as a boy with three brothers.  You're imposing female thinking of jealousy and/or "feeling inferior".  Stop babbling about a matter you have no competency in and then pontificating about it. 

I know how boys think and what the import of this comment is.  If you don't know a person's character, then switching to Spanish ... when you know the man speaks multiple languages and is more comfortable with Spanish than Italian, the expression about the "little jerk" is "showing off" doesn't simply pop into your head as your first gut reaction.  I thought nothing of it myself, thinking it natural.  If he really wanted to "show off", he would have done the Wojtyla and also used some English.  No, this speaks VOLUMES about how the brothers perceived him.