I enjoy exposing myself and jacking off, but only in front of (usually older men) that want to see it. I don't do it to try and shock people or get them upset. It's a bad idea all around, and could get you in trouble. Forget it. I used to get my pants and underwear down in the adult theater exposing myself to many all at once, but it was okay of course.
Maybe some guys, I suppose. Still, I like to pull over somewhere to get my pants fully down and go all the way right there with a paper towel handy so there's no mess. I've gotten too carried away where that's happened. I hope not to in the future; it's not like I don't know what's about to happen.