Please post sizing info on, utg3 open, your 3bet, your CB and the x/r.
Any other info on SB would be VIP. Stuff like how old is he, where is he from, is he well-dressed (ie suit), was he caught bluffing before etc would be very helpful
I played a decent amount of cash games and I can tell you that folding is a really bad idea when you have something 
Well, if you think that he only raises sets then go ahead and fold flop. But does he always call 33/44 oop though vs an open and 3b? I wouldnt, but live players suck so its very plausible for him to actually have those hands in his calling range
As x3 said there are 12c of AQ which is plenty + 4c of KK which he could easily flat preflop.
I think that him raising AQ oop vs 4 guys is unlikely but possible. But I do believe he can play KK like that.
So yeah, I would need a very good reason to fold.
Looking at the size of the pot is vip as well. If our 3b pre is really tiny o then folding might be ok. But if our 3b preflop is massive, 5bb-->25bb and we build an 100bb pot preflop then bet folding with 160bb effective stacks would be lighting money on fire.