Go for a smaller European one, the one I’m on is in Finland. Me, I like Finland, the fins are sexy. And why only use one instance, you can have a user on several, that way you can downvote your own posts and discuss with a person that is as intelligent as yourself (mainly because it actually is you!) I mean: you can try out the audience and communities, which are different on all servers.
US Americans seem to refer to themselves as “Americans” a lot on social media. Or they refer to themselves as “the world” like in “this icecream is the best in the world” (without having visited any other country for a significant time to be able to compare). In Europe, US Americans are referred to by different names: the popular „yanks“, the German “Amis” (die spinnen doch, die Amis), depends on the country. The prevalence of new names is increasing rapidly, e.g. Trumpists, US twerks, dropkicks.
Start laughing and say: “you kidding me now. Right?” Then keep on laughing, shake your head and change the topic.