Karen will probably go down as one of the most lambasted names in history, all while not being associated with any one specific person. Instead, the name owes its negative online perception to a combination of factors, but most notably, a questionable haircut and an overwhelming desire to speak with the manager.
The problem here is that Karen was an extremely popular name, to the point where almost everyone knows someone named Karen. The internet deemed it fair to label all Karens as this way because the behavior associated with them is as common as the name.
There are very nice Karens out there, but until the internet decides that they aren’t the worst people in society, this is a name you will probably want to put a red line through for many years and absolutely avoid as a baby name.