Seriously, don't assume there is racism under every rock. That is a dismal, pessimistic, miserable, negative, and hateful way to go through life. Bad people exist, yes, but it is terrible to presume the worst out of every unpleasant interaction and terrible to take it as a matter of faith that the world is all about tormenting any particular group of people.
Cheer up. It's good for you. Appreciate the improvement and opportunity.