Kings, Paired Board

[Mercman572]

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Fold to the flop 3-bet. It's unlikely that he has less than trips.

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I took it to be him overvaluing a PP since the board paired.
Guess it depends on how thoughtful you assume the opponent to be in this situation (i.e. my raising is a bluff since nobody bets a paired board with the goods, 2 me raising is not a bluff because of the flush draw, 3 the oppeonent thinking "he has overcards so I should bet", 4 I like my hand and don't care what the other guy has). 4 can be any kind of hand depending on the individual villain.

I don't know what percentage you could generalize that this is a PP vs this is the trips and I'd be interested to hear peoples oppinion on this for the 100NL level.
Had he led the turn I would have been very inclined to fold.