You couldn't be more wrong! You can't have freedom of expression while at the same time oppressing "insults". What's insulting is subjective, and if you start censoring that, there is no freedom of expression left.

You can't expect everyone on the internet to be nice to you. That's okay. Grow a thicker skin, ignore them, tell them you don't like them, but no matter what you say, they should be able to express what they want.