https://www.dictionary.com/e/slang/karen/
SLANG DICTIONARY
Karen
[ kair-in ]
WHAT DOES KAREN MEAN?
Karen is a mocking slang term for an entitled, obnoxious, middle-aged white woman. Especially as featured in memes, Karen is generally stereotyped as having a blonde bob haircut, asking to speak to retail and restaurant managers to voice complaints or make demands, and being a nagging, often divorced mother from Generation X.
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A group of geese is a gaggle. A group of cows is a herd.
A group of Karens is a complaint.
I have actually encountered more Boomer Karens than Gen X Karens. However, I have encountered faaaaar too many Karens of all ages. My experience is that they can be of all races.