I've been reading though this but can't work out if I missed @Eldrick47s responding to the accusations that they're a man lecturing women on what they can and can't be upset about.
I'm also really confused how the US is being held up as the most racist country ever (it doesn't seem to be an argument that they are currently in this position) without mention of South Africa (I agree with comments on the European colonial powers (including Britain) and Nazi Germany as well but South Africa seems to be a glaring omission in the discussion).
I personally have no objection to the word Karen being used to describe a racist white woman. I suspect if I was called Karen I wouldn't love it, but my name can sometimes be used to describe a certain type of annoying person and it is what it is. I agree there white women have a unique brand of racism, but I'd further separate that because I don't think it's the same across all white women - in that the type of white woman racism we're talking about here is a US white woman thing (and Afrikaans white woman!). There is white woman racism in the UK, but to me it's different BUT I'm a white woman and completely accept I may be missing something completely.
I don't think that the fact that Karen originated as a term used to describe a racist white woman, should mean women can't object to it being used to as an alternative to 'bitch' in other circumstances. That's a straw man argument. And yes of course this is not the world's biggest problem, but this is an internet forum where people have 1000s of posts discussing whether penguin bollards are a good solution to a parking dispute.
I remember seeing a friend's son say 'sure Karen' to her when she was telling him off about something - there is absolutely no doubt Karen as most commonly used in the world I live in is misogynistic. In real life, I can't think of a time I've heard Karen used to describe a racist white woman.
The interesting thing is the world I live in is majority non-white but there are very few black people in the demographic and those who are are not from the US/UK. I'm wondering whether some of the argument in this thread is because the term is actually used differently in different communities? Maybe in some parts of the UK its original meaning is still being maintained? I can see some previous posters have said this and wanted to call it out.