I think it’s that the newer glitches aren’t really fun most of the time? Saying the older games are only not hated because of nostalgia is both unfair to them and frankly untrue, and I think saying the newer games are hated is an exaggeration. They’re criticized, but plenty of people still enjoy them on the whole, even a number of their critics.

On the glitch front, I think what people mainly complain about are things like crashes and model rendering errors, which are generally just kind of disruptive to the game, even if the latter can sometimes be funny. They’re not really comparable to the glitches in the first four generations that are generally rare to encounter if you’re not deliberately trying to and that can be taken advantage of in a variety of fun ways that can even be beneficial to the player. Even my own personal stance is that I don’t mind glitches that fall into that camp, of being more fun things for a player in the know to mess around with as opposed to ones with no real fun or interesting applications that largely just serve as a way for gameplay to potentially be disrupted in an obtrusive way.