Tell me - would you be OK with using Magda as a synonym for "stupid and offensive"?
That was a very Magda article you wrote. How can you be such a Magda? What a bunch of stupid Magdas.
You would be right to be offended.
So why is it OK to use Karen as a slur? Answer - it is not.
By the way, your strategy of attacking your own allies who want to help you is just not a good idea, aside from being morally bankrupt. Watching the American left do stupid shit like this for years has been very depressing to those of us who don't actually want the Fascists to win.
Given that you have left the United States, perhaps you shouldn't be criticizing those who have not given up the fight.