Just tighten up goddammit!

You're right that AQ isn't a good 4bet/call hand, but it is a good 3bet hand, esp. if villain likes to call 3bets.

Calling 3bets in position is fine if you know they're a light 3bettor and know a little about their postflop tendencies in 3bet pots (capable of c/folding low flops with overcards? great, call those 3bets. auto cbets any A or K high flop and occasionally double-barrels? great, call those 3bets with AJ+/KJ+. etc.). But in general, against players you don't have history with, you should be folding to 3bets.

Find fish, get position on them, wait for hands and valuebet them. Resist the urge to make fancy plays or catch others making them for awhile. This game is easier than you make it!