I was at a local casino here in South America last night playing some small stakes NLH. Blinds were 25-25 in local currency ($1.60-$1.60 in USD).

People here tend to play very loose pre-flop, but after the flop, they don't usually bluff much. A big raise after the flop means the person has two pair or better 90% of the time (I've lost too many pots by calling big raises with top pair good kicker. They ALWAYS have two pair or better).

I folded AA face-up on a KKT board. I had raised pre-flop and got called. Then I bet on the flop and got raised. I figured the guy probably had a king and folded my aces face-up.

A few hands later, I had QQ, raised to 150 pre-flop and got called by the same guy. Flop comes J42 rainbow. I bet 500 and the guy calls. Turn is a blank. I bet another 500, and the guy raises to 1500, which would have put me almost all-in. There were no overcards or straight or flush possibilities on the board, and it's possible this guy was bluffing since he saw me fold AA a few hands earlier, and figured he could get me to fold if he bet big enough. It is also possible he had AJ or KJ, although I don't think he would have made such a big raise with a hand like that. However, it is also very possible he had two pair with J4 or J2 or whatever. People at this game will routinely call pre-flop raises with hands like that. It is also very possible he had a set.

What should I do in this situation? Call or fold?

You need to make effective stack sizes, I'm not going to try and decipher it, I don't get your flop sizing, you overbet the pot then under represent your hand by betting the same amount on the turn?