I think they wanted an excuse to make some headlines so they took the bait and ejected him. I think a formal warning would have sufficed, however, I can understand why they may react in this way to a situation which has been evolving in this way for a while now... I mean, when would it have stopped? Joel made it quite clear that he didn't enjoy Aaron's advances and yet he kept on pushing. Eventually you end up with a Daley/Hazel type incident and all Hell breaks loose.