[MRBAA]

Saying "you win" to get an opponent to muck is a fairly common angle. Hence the sensitivity. Common sense suggests, however, that where the player isn't a known angleshooter, he should get the benefit of the doubt. And no one should muck without seeing a hand that beats them -- that is the best defense against many common angles (for example, saying "I have the flush" on a board with three diamonds, then opponent mucks, angleshooter turns up "flush" both red but one a heart "omigod, I really thought I had it. Too bad, you mucked so I get the pot")