I didn't need the back half of that sentence. It's basically, "take this ethnicity (given how they live)" -that doesn't help your argument, it dismisses criticism of it.
She posted that shit in America and it's normalised there, too. And you don't know what him and his team discussed, you don't know what he and his wife talked about during the stages of your relationship. You're rightfully angry about her posts and his handling of it, but to say, "well they're Serbians," isn't any different that saying "they're Romanians," or "their Israelis" they're more likely to hold racist views.
The countries may have racist policies and racist practices, but you shouldn't dismiss the people from that country.
America is completely normalised with racism, it's not "better than Romania," that's kind of the point with world-wide protests against police discrimination.