Please explain why this is bad....

Full Tilt 1/2 Hold'em (8 handed) from (Format: Bet The Pot)

Preflop: Hero is CO with , .
1 fold, UTG+1 raises, 1 fold, MP2 3-bets, Hero calls, 2 folds, BB calls, UTG+1 calls.

Flop: (12.50 SB) , , (4 players)
BB checks, UTG+1 checks, MP2 bets, Hero raises, BB 3-bets, UTG+1 folds, MP2 caps, Hero folds, BB calls.

Turn: (11.75 BB) (2 players)
BB checks, MP2 bets, BB calls.

River: (13.75 BB) (2 players)
BB checks, MP2 bets, BB calls.

Final Pot: 15.75 BB

Results in white below:
BB has Kh Ad (two pair, threes and twos).
MP2 has Ks Kc (two pair, kings and threes).
Outcome: MP2 wins 15.75 BB.

Cold calling 3 bets preflop is retarded. I don't care what your cards are. Raising the flop with an underpair to the board on the flop in a multi-way pot that was capped pre-flop is almost as retarded.

Can I invite your friend to play in my games?