>it wasn't specifically about generation x-ers

And if it isn't specifically about Gen X then it's not a "Gen X film" IMO. I would consider a Gen X film a film that shows the Gen X experience. Dazed and Confused hits on timeless themes but pretty much nobody would point to it and say "That's what being in Generation X was like"

>but it was a hit amongst generation x-ers

This is different from a "Gen X film" in my opinion. That's just naming films that were in the pop culture of generation X and that could be just about anything from Dazed and Confused to Dumb and Dumber to Tremors.