Wait. Are you arguing that Antebellum slavery was not a formal, legalised system that oppressed black people? You're the one who snuck in the word equally. No, equal oppression of all people in a group (as well as being impossible) isn't required for a system of oppression to exist.

But no, racism is not the same as oppression. That isn't simply a semantic distinction. I've had people call me names, or assume I was far less capable than I am. I've even been denied entry to a restaurant once because I'm black. I don't consider this oppression. This is the kind of frustrating stupidity that many people, including people who aren't black, have experienced corollaries of.

Many women will have experienced far worse than this on account of their sex. Gay people have experienced this kind of thing on account of their sexuality. But given that the definition of oppression is:

"Prolonged cruel or unjust treatment or exercise of authority."

And not:

"Dealing with the occasional bigot who thinks you're inferior"

I don't think it's semantics to say that slavery and segregation meet this standard in a way that the occasional encounter with a racist asshole does not. But let me check in with you. Have you experienced anything that could reasonably meet the first description? Because my issue here is that I strongly suspect not. I don't think you're too sensitive per se, I think, as I said right at the beginning of this conversation, that you're defining yourself by suffering that isn't yours.