The misnomer Karen might be a convenient shortcut to explaining the profound problem of racism and white entitlement, but it raises another profound problem. Do not confront racism with sexism. It is misogynist stereotyping. Every nasty woman becomes a Karen. The term is often paired with other sexist put downs, like shrill or loud mouthed.
Calling a woman a Karen is simply another way of controlling women and their behavior, telling us to be quiet and stop complaining. It legitimizes misogyny. I speak out about injustices, equal rights, and climate change. My view is on the other end of the political spectrum from most Karens, but I am sure that my opponents would prefer that I too would shut up. I will not. Does that make me a Karen? Probably so in their eyes.