Long-term American expat here. I know you're only trying to make a point, but racism is almost never the first thing anyone mentions, even if they're talking about America, which usually isn't the first thing someone wants to talk about.

And when it does come up? Well yeah, racism in America is a huge problem, and I don't think expats have any problem talking about it.

Being thin-skinned about your country's complicated history is never a good look.