I've exhausted my interest in this but

IMO generational is -relevant or pertaining to a particular generation- but what was really meant in the meme is that this is something people have talked about for a long time, in fact for multiple generations, and generations are irrelevant to what's being discussed. Ancient would be a better adjective or time honoured, or age old. Zebra stripe debates aren't particular to gen alpha, gen z, millenials, or boomers.

I just think generational is a trope in and of itself and is losing its meaning through over use.