There's a subset of people that anytime a comparison is made, where one situation is worse than the other, something happens where they become unable to understand the concept of a principle.

It's like you recognize "hey, chattel slavery is worse than wage slavery!" (which is correct), and therefore there can be no principle applicable to both situations (incorrect).

I assume it's that you're offended by the comparison, and the emotion gets the better of you, disallowing you from thinking clearly about it. I don't know what else it would be.