So many times I get dealt KK/AA, do the standard stuff preflop and then a seemingly harmless flop comes out. Then villain starts to show a lot of aggression and i can't tell whether i'm facing a set/2P or someone who thinks TPTK is good

PokerStars No-Limit Hold'em, $0.02 BB (9 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Hero (MP1) ($1.97)
MP2 ($1.94)
MP3 ($1)
CO ($4.64)
Button ($2.54)
SB ($1.98)
BB ($5)
UTG ($4.95)
UTG+1 ($4.94)

Preflop: Hero is MP1 with K, K
2 folds, Hero raises to $0.08, 3 folds, Button calls $0.08, 2 folds

Flop: ($0.19) J, 4, 10 (2 players)
Hero bets $0.14, Button raises to $0.32, Hero calls $0.18

Turn: ($0.83) A (2 players)
Hero checks, Button bets $0.30, Hero folds

Total pot: $0.83 | Rake: $0