You know, just stopping watching her. If she is on the VMA's, don't watch. If she does something dumb(or anything) on YouTube, don't go look at it. If you don't like what she is doing don't buy her music. Don't follow her on Twitter or anywhere else.
If we don't follow these people and don't buy their stuff then maybe they'll get the message. She is just doing what others before her (Brittany and others) have done in order to be famous and make money. And she is being successful at it.