Yay! Just be on the lookout for anything "off" and "nip it in the bud" (so to speak). "Causing a loud noise" could be an advantage if this type of thing is an ongoing issue, however, if these are just a few incidents that just happen in life, you are wise to take them in stride and model this behavior for your daughter.

I do not believe the "few nasty people" should get away with their behavior, though. Perhaps, if something happens, you can make sure others notice. I cannot believe such behavior is tolerated by the majority, especially teachers!

Hugs, and good luck to you and your little darling.