T-shirts vs. Shirts

But I assure you, there is no more pathetic sight than a child swearing in a thin, childish voice.

I agree with that. It's much more pleasant to hear swearing from a lecturer or professor of higher mathematics/philosophy/history/insert your own, than from a squeaky schoolchild who swears left and right just because it's cool and grown-up. Sometimes, they don't even realize that it looks not just unattractive (forget about that, it's unattractive), but also stupid.