Americans seem very "fighty" compared to people from many other countries. You just have to say something that could be construed as liberal (the American kind) or conservative, too politically correct or incorrect, or mention you ride a bicycle or have an outdoor cat, to set some people off. With some Americans having a conversation is like navigating a minefield, especially those who have very little understanding of the rest of the world and reads everything you say into an American context, language barriers and all.
I love talking politics, and have had pleasant conversations with all kinds of people but I have learned from experience to just not bother with Americans, unless they're the very curious and open kind.
We would be riding cows instead.