Uh like two weeks ago at a bar to a guy that was being a dick.
I say it to shithead drivers all the time (when I’m walking or cycling), but I don’t maintain eye contact so it doesn’t count!!1! Usually I make outraged eye contact, then as I keep on past I say “fuck yoooou!” Loud enough to be heard. This seems a smidge less aggressive than maintaining eye contact while yelling it, I think just enough less aggressive to (hopefully) avoid being hit by an angry driver in retaliation.