I never heard of a person getting kicked out of a game for rooting for the opposing team, there must be more to the story. Here is someone else’s story on what happened:

Random guy yelled at Lil Wayne at #MiamiHEAT game. Weezy looked back, gave him a mean stare & gestured he had a gun. LOL what a douche. Weezy just got into argument with security at the #MiamiHEAT game. He got kicked out for gun gesture. @EthanJSkolnick he made a gun gesture towards a fan in the crowd. That’s why they made him leave.
Danny Vega