Well I have had two whacky experiences with unprovoked attacks at the 9:30. Once was there with friends enjoying The Crystal Method, and some woman behind me started punching me in the back. I had not bumped into anyone, had not drugs or alcohol in my system, and she started punching me. Fortunately she was weak and I just turned around and laughed at her.
The second time was The Orb with a friend. Was pretty crowded so dancing consisted of lifting my heels off the floor and not much more. So, now some girl is putting her feet under my raised heels. I move forward, go up about 15 feet, she keeps doing this. Then she goes to her friends "I can't believe he is stepping on my feet", to which I turn around and reply "Quit putting them under my shoes, and stop following me". Her friend then threatens me with a "Watch out, we are from New York". I laughed this one off too.
There are assholes everywhere, and I refuse to be polite to someone who was the one who wronged me. I ignore them, don't get into it, but I am not going to bend over backwards for them.