Sometimes, it is not clear if another person is gate lice or in a group about to be called. So I don't mind if someone cuts in front of me. If it is clear to them that I am not gate lice, they shouldn't shove their way and go to the front.

I suppose if one is really irked, they could yell "I am zone 2 and anyone who shoves past me is going to make me snap and demand the plane fly to Havana!". However, this adds significant risk to being detained. Either that or nobody will shove their way past you.