NBA game Wizards vs Mavericks 1/21/2008?

I am an away fan of the Dallas Mavericks attending the Wizards vs the Mavs in DC. This is my first time going to an NBA game in the states and I want to know how the atmosphere is towards the opponent's fans. In England during soccer matches it was pretty hostile for away fans but we were like thousands clustered together so the impact wasn't felt that much. Well advice me on the formal and informal codes of conducts at NBA games especially for the traveling fans.