TV
Being limited to crappy court shows, sitcoms, and soap operas if you were home all day.
TV shows having one person of every race, gender, stereotype, and disability.
"After-school specials."
Sports cutting into prime-time.
Everything being educational or "rebellious."
"Nothing on TV"
Clay and 3D animation.
Rewinding.
Phone
Having to be AT HOME to get a phone call.
Being able to MISS phone calls if the internet or the Fax is on.
The phone charging you for every second.
Comp
Installing ANYTHING on a computer. "4-8 hours + CD swaps."
Downloading ANYTHING, AND being charged for every minute of it.
Games
Playstation 1 Load Times.
Corrupted Save Files - Have you played Dragon Quest? Fuck that game.
Having to beat a 3-4 hour game in ONE sitting with FOUR lives on an "Easy mode" that's today's "Hard as Fuck."
Playing a platformer with 2 players. If they didn't jump, you died; if they died, you died; if they got in the way, you died.
EDIT: Also, the localization process tv shows and games went through in the 90s was terrible.
Everything that was "foreign" (yes, any kind of foreign) or "morally questionable" had to be edited out of nearly everything.
A character looks too Japanese and he's not a ninja? He's redrawn.
You fight a woman? Now she's says she's transvestite.
Wait, that was too much. Next time a male character is edited into her place.
No black characters in the game? Looks like one of your main characters has got to go. With cliche dialogue added.
Outside of the fashion, entertainment, and technology, I can't really come up with gripes that were from the 90s.