Against Live Poker Ethics or Not?

[invulse]

This situation happened to me about 2 months ago, but I have never really heard a definitive answer from anyone about this.

I was sitting at a $100/$200 2/5NL Live game with about $600 in front of me. A guy was sitting at the table who was just donking off hundreds of dollars at the table. He was up about $80 on his latest buyin to about $280. I was delt pocket aces and the flop came out KcXcXc, I followed up my preflop raise, he moved all-in, and I called. After I called I looked directly at him and asked him if he had the flush, and he said yes. the last two cards were delt and were blanks, and I almost mucked my hand, but since it was the first good hand I had really had all day i decided to do a 'show the table how much bs this is' move and threw them down face up. The dealer almost grabbed my hand to throw it in the muck since he also heard the guy say he had a flush, when the guy flipped over KdQd.

Is this against ethics to lie about your hand after your allin and have been called? Since then I've never thrown my hand away until I've made sure the person had what they have said, has this happened to anyone else? And if you mucked your hand what did you do after it? The reason I ask this is because I've come across this situation alot in live games since the first time, and I'm not sure whether or not I should be saying something to them about it.