showdown

[iversonian]

1/2 NL. Lunatic bets all in into a T84 flop, player B calls him (putting himself all in), and I overcall with T9, knowing that player B may call with any pair. Turn and river are blanks, and player B shows a ten, beating lunatic's hand. The kicker will determine the winner here. Some history: player B and his friend have been showing down in this manner for a while now and nobody at the table has yet been challenged to show both cards involuntarily at showdown. I sit there and I wait for him to show his kicker. He tells me, show me your hand now. I ask, what's your kicker? And then he starts to get angry and hostile, like, "I showed you my hand, but you don't want to show yours? Why do you need to see my kicker?, etc." Now, don't need any help figuring out what the rules say about showing down hands, and neither did the dealer. But how do you think I should have responded?