I posted this story a few years ago back when the GAC was still around but it still is one of the rudest things we ever experienced at
Disneyland.
DH, DS and I were waiting to get on TSMM using the alternate entrance. (DS is ASD so we have a GAC for times when the crowds get to him.) There were at least 15 people in line ahead of us and this man pushes past with a young girl. A few of us said something about the back of the line being behind us and he shrugs and said "I've got a pass, I get to go to the front!" He waved his GAC in my face but I would not let him past me but instead got the CM's attention and she tried to get him to leave the line to talk to her. He ignored her and kept trying to get past us. I told him that the CM wanted to talk to him and he finally went back. A few minutes later, when he saw that the CM was busy talking to someone else, he again tried to get past us, saying that he had a pass to which I replied "We've all got passes." All the while, the CM was trying to get him to come back to the end of the line and wait his turn.
I would not let him in front and eventually he went back to the CM who told him that if he wanted to get on the ride, he would have to wait his turn.