PokerStars 0.25/0.50 Hold'em (8 handed) converter

Preflop: Hero is CO with , .
1 fold, UTG+1 raises, 2 folds, Hero 3-bets, Button calls, 2 folds, UTG+1 calls.

Flop: (10.40 SB) , , (3 players)
UTG+1 bets, Hero calls, Button calls.

Turn: (6.70 BB) (3 players)
UTG+1 bets, Hero raises, Button folds, UTG+1 3-bets, Hero caps, UTG+1 calls.

River: (14.70 BB) (2 players)
UTG+1 bets, Hero raises, UTG+1 3-bets, Hero caps, UTG+1 calls.

Final Pot: 22.70 BB

Results in white below:
UTG+1 has Ks Kh (full house, kings full of threes).
Hero has Ts Th (full house, tens full of threes).
Outcome: UTG+1 wins 22.70 BB.

Nobody would stop raising a made-set to the possibility of an overcard set. I would've done the same. Even the flop-check.

Maybe if UTG had capped pre-flop you might have suspected a big pocket pair but I've seen guys cap pf with Ax with x as low as 8. Other than that I would have to concur with Barbourman's post. Tuf hand to lose for sure.