NTA. But this could be part of his upbringing. It’s possible to think someone is “low class” without actually thinking less of them. I know this sounds weird (because it is) but let me try to explain. My father tried his best to ingrain class differences in me (I’m European and our family is old money, though I’m definitely not rich) And because of that I can not remove those differences from my mind. If someone says certain words or wears a certain type of clothes somewhere in my mind I put a person in a certain class (high or low). BUT it doesn’t make a difference in I feel about someone. And I would never, ever tell someone where I class them. Because I know it’s wrong and I hate myself for doing it. To me it really doesn’t matter where someone comes from, but it matters what they do now.