appropriatist
A person who constantly falsely accuses others of appropriating other people's cultures when they are not.
Brian: I can't stand Helen! Who does she think she is wearing that tunic? She's a white girl from Queens! She's trying to pass as someone from the Middle East or something. What a phony!
Lai: Um, Brian. She's into Paganism and tunics did originate in Europe. You are such an appropriatist! Are you going to give me shit because I'm from China and I use a fork?
Lai: Um, Brian. She's into Paganism and tunics did originate in Europe. You are such an appropriatist! Are you going to give me shit because I'm from China and I use a fork?