When I get min-raised on the turn here I cannot WAIT to threebet it

Even if I thought this guy might limp 99 or 66 UTG, I still would like to get it all in. He could easilly have 9x and 2x or a draw

Either way you want to get more money in now, if he's got 9x he's more likely to pay you off before a scary river card hits, same with 2x, and obviously if he has a draw you want to charge him

Given you didn't turn 3-bet, were you afraid UTG had a house? This is definately not a check/call on the river