A lot of the negativity comes from the older ravers who have wound up disappointed with the scene. I call them "Jaded Party Kids"
I've been raving for about 6 years now and I can understand some of it. When you rave for a long amount of time, most of your friends leave the scene, either because they burn out on drugs, "grow up" and move on to the bar scene, or get busted/turn to other movements. Then, you try to make new friends, but 90% of them are only ravers for about three months until they burn out on drugs or their parents make them stop or school starts or whatever, so you have to continually make new friends and every time you start to think you have a real friendship, they leave the scene. Also, the novelty of raving wears off, part of the reason your first few raves are so great is because they are new and different... but it gets old. And as you grow up all the cool kids who you used to look up to "grow up" and leave, and soon, you either are one of the cool kids that everyone looks up to, or you're friendless. And being in the second situation is not easy.
Then, some of the negativity comes from hate directed at the rave scene by other people. Let's face it: the government does not like raves and neither do bars and clubs. This is partly because of the damage caused by intoxicated drivers and then mostly because raves move taxable money to a drug that cannot be taxed. This hurts both bar owners and to some extent the federal gov. So then ravers have to put up with raves being shut down, permits being denied, and all kinds of bureaucratic discrimination that can be frustrating. In Seattle police will treat you differently if you wear kandi. That kind of bullshit is reflected in frustrated ravers.
Second, there is a culture that holds contempt for ravers. When you say, I'm a raver, it's almost like saying, I'm a druggie. And we live in such a cynical world that when you represent values like PLUR people think it's just the drugs. That can aggrevate people and cause them to minimize PLUR in order to avoid harassment.
Third, there are people who go to raves bringing hostility. Some people come there with the intention of taking advantage of drugged up people. Some people come to raves planning on picking up a cell phone (happened to me, guy got caught with 30 of them). Some people come to raves angry, intoxicated, or violent (Capitol Hill Massacre... RIP Sushi). Not everyone at a rave is a raver, and a lot of hostility comes from that element.
Finally, rave-drama brings negativity. Ravers are not spared the feelings of jealousy, pride, etc, that cause drama and negativity.
But I think the most important thing to do, and the only thing you can do, is represent PLUR to the utmost. This world can be a very dark place, so, be the light in it. Ignore negativity or turn it. Don't let anything bring you down and do the best you can to bring everything up.

s.
Magnum