Tell Catholics/ "trads" you just meet your position on the new rite being doubtful/invalid?
That the NO 'mass' is a sacraligious abomination?
If you see someone with a divine mercy image do you go out of your way to tell them it's a false satanic deception?
I don't really do so. Only 1 person at my chapel knows my position on the new rites. I didn't want to come off as autistic and presumption and scare them off if i don't know them well. Is this prudence or cowardice?
It's not like they are automatically going to believe what i tell them, especially against their 'authority' figures.
When I first became a traditional Catholic I was a bit "over-zealous" and tried to tell everyone about tradition...but it more often did more harm than good...
As Fiorenza said...Prudence is important.
Usually I don't offer information unless people ask (they usually will inquire if interested).