I'm american, and this is me giving a fuck

I'd say yes, a lot of Americans react badly but that's because so many of the American jokes are stereotypes. All Americans are fat, all Americans are assholes- whatever. It doesn't matter how you say it, or how funny the joke around it is, some people are going to be offended because obviously it's not actually true. I really haven't seen any jokes about countries that are stereotyping in the same way, so best not take it too far and start saying that all Americans can't take a joke.

That is all.