Found this on the "Labor Day Horro Stories" section of the General RVing Issues. I think it was rude. Never says why she needed/wanted to go to the head of the line. Had she said something about an emergency she may have been allowed to go first. If she didn't her bad.
"My only problem came at the dump station. A real nasty lady (swearing at everyone) and her family tried to cut in line at the dump station. She tried to cut around 10 of us who had been waiting there for a least 30 min. I had to use my truck and 5th wheel to block her. The ranger made her driver all the way to the back of the line. I got the 1 finger salute when they left. I think I ruined her day. The other campers thanked me for standing my ground with her."