sb went all-in? JJ can be very vulnerable in that situation. How easily a flop with an A,K or Q could crush you. Besides that, your hand might already be beat if the small blind went all-in and only had a fewer chips than you. You could take a chance that you have the best hand, but I like your fold in that situation - wait until you get a hand that YOU feel good about pushing all-in. You weren't the donk there.