Heh, the only reason I complain about my phone is because I can't do enough things with it. Or at least not comfortably (and without requiring root, which is easier said than done depending on model). It just annoys me how bad the UX is compared to a proper computer with a keyboard and window management. I was once hospitalized and unable to move, with only my phone to pass time, and the experience was SO frustrating!

I don't use my phone a lot, all I got for entertainment is Retroarch, Lichess and a generic sudoku app I got from F-Droid, so obviously my opinion is highly subjective, but it feels like having a supercomputer that can only run MSDOS. One thing at a time in fullscreen with maybe a few passive resident processes. I know some phones let you split things in two or so, but not all of them and the implementation is never flawless or limits what apps can be split.

If you mean hating the phone as a social thing, I am a bit self-conscious about being seen using it too much or taking it out in front of someone unless warranted. I wouldn't do stuff like crossing the street or driving with my eyes glued to it. But that's a people problem and not a phone problem, I think.