I agree on moving if someone is being a nightmare. Its annoying when youve found a good spot but feeling safe and happy is way more important than dealing with someone whos way too wasted, agressive or acting inappropriate. I was violently threatened before at jazz world stage years ago right down the front by a very wasted angry lad, he threatened most men and women around him demanding more space, we were all packed in like sardines, created a horrible stressful atmosphere. It was hard to move but i politely explained the situation to people behind me and they let me and my partner move back a few spaces. Also got threatened to have a glass bottle of whisky cracked over my head on the way into the rabbit hole by a group of lads who pushed in at the front of the rabbit hole queue that looked to be about 2 hours long. I called them on it and it did not go down well with them. Staff saw it and the glass bottle and did fuck all. Always some bad people around but to only have those two incidents in 10 years of Glastonbury is pretty good going, especially considering how many incredibly friendly people ive met / made friends with / have been helpful and kind.