Like. You ask me to define "Karen" and I'd say it's the lady today who said she wanted a chicken sandwich then threw a fit when I told her we've never served chicken but could do a turkey burger, calling me stupid, insisting we've always given her chicken before, then insisting she speak with the manager (which is me).
Meanwhile, my 16 year old sister was telling me about a Karen at her work (she works in a really nice retirement home) who was a lady who asked for no sugar in her tea, was given sweet tea, and then explained she couldn't drink it because she was diabetic and it might kill her. "Like, she was such a bitch," my sister said, "She wouldn't even drink it! Told me to send it back and get her a new one!" Which, like, maybe it's because I'm old now, but if I messed up someone's drink and they had a medical condition that kept them from drinking that drink, they're not the bad guy in that situation. The proper response is to fix it, but my sister's been raised by her phone and is on TikTok all the time and thinks that "Karen" and "mild inconvenience" are the same thing.