Flush draw jamming sillyness

PokerStars 3/6 Hold'em (10 handed) FTR converter on zerodivide.cx

Preflop: Hero is MP1 with Ks, Js.
UTG calls, 1 fold, UTG+2 calls, Hero calls, 3 folds, Button raises, 1 fold, BB calls, UTG calls, UTG+2 calls, Hero calls.

Flop: (10.33 SB) 2s, 4s, 4c (5 players)
BB checks, UTG checks, UTG+2 checks, Hero checks, Button bets, BB folds, UTG raises, UTG+2 folds, Hero calls, Button 3-bets, UTG calls, Hero caps, Button calls, UTG calls.

Turn: (11.16 BB) 6h (3 players)
UTG checks, Hero checks, Button bets, UTG folds, Hero calls.

River: (13.16 BB) Ah (2 players)
Hero checks, Button bets, Hero folds.

Final Pot: 14.16 BB