I mean, the way I try to tell people is to just put yourself in their shoes. How would you like to be mobbed with no breathing room? Not many people would at all. I mean I admit; I am pretty open with bands; I go and strike up conversations with them. Of course I let 'em know how much I appreciate them; and then i'll talk anything from videogames to whatever they wanna chat about. If they don't feel like chatting; that's fine too. Hell, sometimes I am not in the mood to chat either.
Basically, people don't understand it seems that they're people. You have eccentric ones, quiet ones, loud ones, goofy ones, polite ones, etc. I mean, sure. Give your appreciation. But that also means give your consideration as well. Don't act like an ass and you won't be treated like an ass.
I swear, to this day, I never understood it. I mean, when i was like 14 I remember being kinda on the starstruck side...but some people just don't grow up. Sure, I get a little nervous before a big interview sometimes; but that's natural; and it's natural to maybe be a little jittery around someone whom you really appreciate as a musician or whatnot. But let it pass and just relax and remember to treat them as you'd want to be treated. Don't be a jackass, don't be rude. Sheesh. I see this all the time myself and it does get me a little mad.
When I was in Europe hanging out after the No Mercy fest, there were tons of bands walking around outside, right in front of the venue...Marduk, Darkane, Nuclear Assault, Testament...and they didn't get mobbed; the people were patient, considerate, and just sort of milled around and chatted with them all. Pics were taken, stuff signed, the whole nine! and these bands stuck around outside for quite awhile. Here, if that happened, whoooosh!!! a rush. i just don't get it.