I keep running into this time and time again. Any suggetsions for helping me lay it down when I flop TPTK against a set?

For best results post hands with stats/reads to get advice in specific situations.

Really, all I can say is think about your opponents range when they raise you, what kind of hands would they be raising you with? If it's a LAG player, it happens. If it's a normally passive player, watch out!

2nd hand of a 9 handed SnG;
Blinds 25/50
AQ in the BB, action is folded to the small blind, raises 3xBB
I call
Flop A-Q-3
SB checks, I bet flop, he calls
Turn - 7
He checks, I raise 2/3rds pot, He reraises all-in, I call
He had 3-3, made a set

The hand range I thought he had AK, A7, KK, something along those lines

2 Questions

1)What was the buy-in?
2)Was there a possibility of a flush draw on the flop? And the turn?

1.20 Buy-in
No flush possiblity

That wasn't TPTK (Top Pair Top Kicker) , you had top two pair . It's a cooler but I'm never folding that . Maybe play it cautiously in the early stages .

Just checked with pokertracker , had 25 times top-two on flop (when seen flop) and lost 3 times . One was an AA backdoor flush , one was preflop allin so not sure if it counts , and finally the third which i played like a donkey to check-call all they way (had J8 - J 8 2 flop. 2turn and K river and he has K9 betting all the way) .

Point being , overall you should win against random , maybe vs someone really nitty who plays like 4 hands /100 in the early stages you can consider a fold if you don't have much invested .

Weird line from villain, I would find it hard to give him credit for a hand. I'm never folding there, in a $1SNG i'm expecting this to be a really dumb bluff or a weird 2 pair more often than not.

Honestly I find it much harder to find a fold against a set in tournament play, you just don't get the history with people as you do in ring games. As well as the fact that you are often much shorter stacked, making getting it in with hands like TPTK correct.

You can often identify a set when your opponent is show an unnatural amount of aggression on a fairly dry board. For example, if you hold AT on a T52 board and your opponent starts going crazy there is a very high chance you are beat. You should be less worried about a set on a draw heavy board because there is much greater chance your opponent is semi-bluffing.