Mexican isn’t a race. What you’re saying is ultimately the same as saying “some Americans are racist against their own kind.”
I am aware of this
But let's be honest, you know what the deal is. "Black" isn't a race either. At least not an actual one. If it is, then why isn't "Brown" and "Light Brown" a race.
There's no country on the planet that is a race, but you know what the deal is when someone says German or Samoan.
Jewish is not a race eithet but you know