Villain is very loose preflop, makes these donkish minraises preflop a lot. He has an AF of 1.7 so he isn't all that aggro postflop but he's not passive neither. Can I lay this down or do I have to go broke here?

Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($256.20)
SB ($193)
BB ($687.77)
UTG ($282.41)
Hero ($207.90)
CO ($155.05)

Preflop: Hero is MP with 9, T. SB posts a blind of $1.
UTG raises to $4, Hero calls $4, CO calls $4, 2 folds, BB calls $2.

Flop: ($17) K, 2, 3 (4 players)
BB checks, UTG checks, Hero bets $13, CO raises to $43, BB folds, UTG raises to $73, Hero ??????!!!