Making your nationality your whole personality

This is probably a common occurrence in every country with a significant amount of people living abroad, but seeing many people from my country doing it, just makes me cringe. I know a woman who has always been pretty normal, but since she moved to Canada she's literally obsessed with the fact that she's Mexican. You know, always making comments and posting about how she's so mexican. Worst part of all is that this "being so mexican" is a cartoon identity to seek for validation with her foreign friends. Of course this includes joking about stereotypes like we jumping the wall, being alcoholic, etc. Also, most countries in the world are pretty much the same, so this whole "I'm from X so i act a certain way" is just nonsense. Wow, you come from a country where people loves music, parties is family oriented and there's crime, you're so special.