> Note: when the screwup was, say, due to people from our TX helpdesk, they would never say “Oh, those Texans screwed it up”

I can't speak for everyone everywhere, obviously - all teams are different and have their own attitudes - but I did some work in India with a tech support team and the phrase "the American's screwed it up" was used a reasonable amount in the cases we looked at.

For whatever it's worth - which, again, isn't much other than to say that any individual (you, me, etc.) experience isn't a set rule, at least one my U.S. team the women (including PoC) complained about the India team's work significantly more often than the men, though I think this was because some of the men happened to interact more with the India team and so got to know them a bit better (there were exceptions in all directions, but I'm just saying majorities here).

I think it has much less to do on both ends with any kind of actual bias and more with the ease to blame the team "over there" as opposed to people next to you - people blamed teams in other parts of their own building (U.S. and India alike) just as quickly/often as ones overseas.