Why do you feel that you need to be able to see the point of it for it to be ok or non-offensive? Maybe you don’t see the point of it, but others see their own point and don’t have to justify it.
Should every possible characteristic a living entity can have also be a protected class?
People didn't start calling a toilet Jon because they wanted a label for the sterotype of an entitled asshole.
I guess its a form of virtue signaling. You have to be cool and know meems to know what calling somebody a Karen even means.