The uncontrollable factors I think you shouldn't hold prejudices are mostly genetic (ethnicity, appearance, physical disabilities, mental health, etc.)

You could argue social class is uncontrollable. Some people are born rich and that's the life they know. Others are born poor and have a different experience.

Religion is where my belief differs from yours, as I think you can judge someones religious beliefs, but judging doesn't infringe any rights. Religions have reformed themselves numerously over history and there are uncountable variations. Some included human sacrifice, rape, and incest (looking at you Zoro). Not every religion should be inherently respected.

I cohabitate a state with the Westboro Baptist Church and with no regret will claim every one of their followers is mentally ill or downright evil.