I'm so sorry to hear that. That would've destroyed me if I were you. Maybe it's better if I don't meet him because if I were to meet him and he acted like that, it would kill me. I, myself, am bipolar and experienced a lot of things that Max did so he's definitely a hero to me and it would suck if he acted to me that way.
I am a HUGE Max Bemis fan, so this meet & greet was a dream come true. I realized I wouldn't be able to have an hour long conversation with him or anything like that, but it was so apparent he didn't want to be doing it. With his social anxieties, I don't understand why he would open himself up to a meet & greet situation in the first place. His band members were awesome, though, and made up for the disappointment he created, so for that, I am grateful the entire band wasn't a dud.
But, that's the price you pay. It's almost a better idea to not meet your idols, just in case they don't live up to the mythos you've created in your head. Sometimes, your perception is better than the real deal.