Its a real shame people act like this but it will never stop, you only have a couple choices and they are ignore it or do something about it.
Generally if you ignore it and let it go its the end of it.
If you do something about it the consequences can be unfortunate to say the least.
Frankly, i never tolerated bullying in school when i was younger or anywhere once i was an adult and i never will.
This may cause me some negative impact but you can be damn sure nobody including myself will be bullied while im there, i simply wont tolerate it, it will go as far as they want but these people should be taught a lesson.