I once got into an online argument with a couple of women who clearly defined themselves by their African-American ethnicity. My ethnicity was never disclosed, nor was my gender, nor were we even discussing ethnicity or culture at the time. However, two of these female commenters whose online names and conversation clearly defined them as black and female (ex: 'Afrikan Queen', 'Melanated to Perfection', etc.) deigned to call me a 'Karen' for disagreeing with them on a particular issue. Why they needed to name-call is up for discussion. So, I decided to return the favor.

So I called one a 'Laqueefa' back. That opened the hornets nest and had them quite irate.

So, that is my go-to name for a black 'Karen'. Feel free to borrow when/if necessary.