I don't think it has to harm locals. There's a way to properly integrate into other cultures without slathering it in Americanism. I have seen a couple friends who were privileged enough to leave do so. They may face issue being black and ex-American, but that's as far as that goes.
Ghana is having tensions between Black American ex-pats and locals.
Also, Nigeria is having tensions between Algerian ex-pats and locals, especially in the culture industries.
American ex-pat community problems arenβt exceptional because those type of community issues are normal across the world.