Bullying/teasing/harassment in Cosplay documentary is currently in the works.
At an area convention I attended, I found about a group that did a documentary on bullying, teasing, and harassment within the cosplay community called "Cosplay with Kindness." They are currently trying to raise money to make a full length version via kickstarter.
While some of us who have been attending cons and such for a long time probably would say that there is very little that actually happens that could be considered bullying, teasing, and harassment. I have to admit I have heard more from younger generations about such acts.