That’s the neat thing - you don’t! For the same reasons that some people in your country will continue to hold their own stubborn beliefs about other people despite all evidence to the contrary, some people in other countries will do the same to you.

I never fit in with my home culture. For me, that’s racist, fascist Americans. Even as a kid I wasn’t accepted by my peers, school admin, and even my own mother. Having grown up under that, and becoming myself despite it all, some of those people (my mother at least) have come around. But honestly, I wouldn’t count on it.

The best you can do is keep being yourself (I know, cliched, but seriously) and live by example. Take it from someone with a lifetime of dealing with this - attempting to convince people doesn’t work. However, those who are open-minded will see you as you are and note you as one of “the good ones.” Instead of trying to change the mind of someone who’s dead set on seeing you as an enemy, focus on the people who already understand that it’s wrong to define a group of demographically-related people by the actions of a few.