Dude, they're not racists for disagreeing with your reasoning.
Racism, of various levels, are built upon hundreds of years of mistrust, inequality and misinformation.
It's not as simple as just "cmon can't we all just get along?". And they are trying to explain this to you. And inform you that it's a difficult and long path that has to be built slowly and carefully, and each place on earth will have to build it in a way that works for them, because all places experience racism differently.
Them trying to explain this to you doesn't make them racists. None of them are saying discrimination is ok. Not a single one.