I’ve know a couple of ladies called Karen over the years but they weren’t a “Karen”
But I’ve seen many “Karen’s” during my years in retail during college/uni days. The abuse you get is awful- between the years of 16 and 23 I’ve had your typical “I want to speak to the manager”, people completely dismiss me as a manager because I’m “too young”, people scream at me, threaten violence against me, demand the number for HR etc etc.
My experience is biased because I worked companies predominantly aiming at women, and even when working at Levis and Bench I didn’t really have many men picking a fight. Whilst I don’t think it’s right to essentially highjack an actual name, I can see where it comes from- when you’re essentially in an invisible, powerless position and left vulnerable by the big bosses that don’t support you when faced with this kind of thing on a daily basis - giving a name to what your facing and trying to make it humorous is a coping technique.