sucks, man. hope you're ok.
i never got beaten up, but i played with a noisecore band for one show many many years ago.. there was a public skatepark in our town, and we noticed there was power hooked up outside, so we went there, set up and played a guerrilla set to an extremely annoyed group of skateboarders. we started fucking with them and getting confrontational (no violence, not even the intent of violence, we were just being annoying 18 year old kids) ... eventually one of 'em took a huge fucking rock and threw it at my van, shattering the windshield.. they all took off, we hopped in my van and drove around town for an hour looking to beat the fuck out of these kids, but we never found them.. i guess i can't say i didn't deserve it, we were being assholes... doesn't mean i wasn't bullshit about it though.
someone actually called the cops (not us), and we'd gotten the whole thing on video, so we showed it to them.. they looked at me, laughed, and said "jesus, you're lucky you didn't get your fucking ass kicked. that was pretty shitty of you guys, i don't blame them."