As a racially ambiguous guy, most people are professional, but I pick up occasional comments and the way people act when you try to show them a better way or correct them really shines a light on this issue.
This is what actual tolerance looks like in action!
You say that is the case. People affected by it say it isn't (and have examples). Who to believe ...
Were there people that didn't like me because I wasn't like them? Sure. They weren't the majority, most people are just fine no matter where you go in the world, and I'm doing fine myself.
Learning to come to grips that you aren't going to like everyone (and that it is mutual) is a large part of the lessons of becoming an adult. Learning to appreciate the fact that most people genuinely are able to treat you professionally at work regardless, no matter what the social media crowds say, is just as important.
It might be harder to come by in smaller metropolitan areas or rural areas.
EDIT Also, it is very difficult to suss out this type of before being hired. Most people at least pretend to be professional until they get comfortable.