"Karen" is not a sexist term. It is a critique of white women who use their privilege to hurt Black people. "Ken" is also a term that describes men who do the same thing. The meme took on a life of its own but the term "Karen" is about being privileged. White women used to get Black men killed unjustly - Emmet Till. This term is a response to the disgusting racism that white women usually escape responsibility for.