Completely agreed. Also literally the only topic I've ever had to avoid with friends. It's not just that we can good-naturedly agree to disagree (like we can with religion, politics, etc.), but they are allergic to even the mention of it. It is something they very actively want to not talk about, which I've never experienced before.

You're right that it's weird in a different way, and I still can't quite put my finger on why.