Why are Poker players RUDE?

Hey all i was just board and decided to watch a Sports show called Poker After Dark on channel 4 and all the Poker players do is stack their chips and when they want to give it to the dealer they throw the chips at the dealer, What is the point of stacking them for 10 Min and than throw it at a person whos just doing their job. This alone should make US gov rethink Pokers right as a sport.