I was at a table that sounds exactly the same, and I picked up JJ in the same position you did. However, your LAGtard2 in my case was less of a LAGtard but trying to isolate my LAGtard1 (who was awesome, open raising 57o and bet, then call two more to him on the flop, he was so money).
Anyways, in my case I bet the river and he showed Q7 off after calling 1 million bets. I began checking behind in those cases and value-betting like crazy in other times.