Yeah...I don't know man. I think that was just a mishap on your end.
First off, J-6 off suit is not a hand you want to be playing anyway. That can lead to a lot of losses because of your kicker. I general don't play any face card with a lower card unless it's shorthanded to 3 or 4.
Secondly, there were 6 cards that could beat you off the turn, when everyone was still in. Generally an all-in like that means the person has perhaps the card that gives them the highest flush. Having the flush with a lower card is no way to call an all-in and be booted out of a tourney. He did get lucky with that full house, but that should've been one you layed down.
I'm not trying to criticize you either, just offering some friendly tips. This is how I, and most players, would generally react in that situation.