Same here, I could never understand why people played Doom, Quake, Wolfenstein 3D or Unreal in the early days, plus I thought this big 3D pixel art was horrible.I used to hate FPS genre, thinking of it as the most brain dead thing ever, compared to platformers or character action games.
Don't get me wrong, I still don't like Doom (1993) and Co.

On the other hand there's also the opposite, game genres or mechanics. Old times I loved turn based RPG, couldn't stand action RPG, probably similar to my dislike of FPS or Diablo like. I always wanted to take my time in planning and executing. Nowadays it's just the opposite, I prefer action RPGs, I guess it's also because I have less time now. Although nothing against a nice turn based combat RPG, I played Dragon Quest XI and Trails of Cold Steel III lately.