Name changed so that I'm not linked to my previous post.
@EndemicPanda in my opinion you've (almost) hit the nail on the head "the real problem is that sexist white men are using the term to try to shut down and demean any assertive woman when there is no race element involved"
In my experience, it's sadly not always men.
I use a popular social media platform in which I broadcast live to my followers.
What I've found, is that when I'm assertive - whether that be calling someone out for the way they're talking to me or another participant...or voicing my opinion on a subject that comes up in conversation, I instantly get called a "Karen" And the expectation is I should find it offensive.
For me, personally I don't. I find it laughable because whoever said it is a sheep, just following the thousands before them that used the term 🤷🏼♀️ And I make that clear to my viewers whilst at the same time making the commenter look less than 1mm high before blocking them 
Jokes aside though, I don't understand the race implication of the term and I certainly do feel for women who's name is actually Karen.
I'll continue to challenge those who use the term, and would like to see the trend die out ASAP (as we all would!)