rules question for a home game

[prosh]

alright guy raises .. I push all in with KK ...he exposes his hole cards JJ and I go to take down the pot ...he says what are you doing I didn't fold I said you exposing your cards is a MUCK... Am I right???
what a cheap move to try and get a read

[thirddan]

it depends on your rules...some allow showing hole cards in tourneys, but it varies...Also some allow it only when heads up...If this is your game you should just let him fold and get over it so that there is no bad blood, just make sure that you have a defined decision rule for next time...