LOL, my first big skirmish game I was coming down a narrow really steep stairwell from a tower and my foot slipped about half way down. I fell down the rest of the stairs on my ass, lost everything in my dump pouch and my pistol came out of its holster. My tail bone hurt like hell for 2 weeks!
As stated most airsofters are pretty mature and a good bunch of guys. You're going to find most are going to encourage you, not make fun of you. In the end, even if someone decides to poke fun, ignore them and have fun, don't let a few jackasses stop you from having fun. I bet if anyone actually said anything they'd be called down for it by everyone else.