What are your less obvious instant prejudices?

If you were asked, “is it ok to murder someone,” you wouldn’t even think. You’d immediately say, “No.” If someone then asked you, “why is it wrong,” would you be able to offer a real life reason (i.e., not appealing to a magically given set of rules) about why murder is wrong?

Murder is wrong as a practical matter. It is like a mutual protection agreement. None of us wants to be murdered, so we gather together as a society to attempt to guarantee that none of us is ever murdered. We punish those who do in hopes of deterring others (which doesn’t work, but that’s another topic).

Can you think of other instant prejudices? What kinds of human practices are wrong? Perhaps some sexual human practices? Then why is it wrong? For example, why is necrophilia wrong? Do you know, or is it an instinctual thing?

I don’t actually want to discuss the right and wrong of things. That can be for other questions. I want to generate a list of instant prejudices. Things you know are wrong without thinking. I also want to know whether, if you did think, you could explain why your prejudice is correct.