I think equality is one of those things we want, but will never have.
Whether we like it or not, we have prejudices. We might not even recognize them for what they are. It's not that we don't like certain people or races or groups or anything, we just aren't fair to them because of something we've heard, faced or seen.
I like all people, but when I was a waitress I judged people depending what I'd heard about them. No matter how much I should have been fair, if I found out they were bad tippers or extremely picky, I didn't treat them like other customers. I tried to rush them out so I could fill the table with people who would do right by me.