So, since Mike has put a hand up and the subsequent discussion might label me weak-tight, let me provide a bit more info.

The villain in question took him out earlier by rivering a junk 2 pair. In that hand, there was no aggression until he had the winner. The fact that this villain will call down with random hands, coupled with how passive party games normally are, gave me the feeling that the aggressive all in move might indicate a flopped set. I'm not saying it would be an easy laydown, or that it's more than a fraction more +EV either way, but I think it would be doable in this situation.