Generally speaking, hurt feelings strike a nerve. Barking dogs don't strike a nerve, therefore don't hurt feelings. However trolls telling tramps that they are sluts hits a nerve. Hell, even my using those terms will get me in trouble because they elicit a certain negative connotation on the female gender (and done to illustrate a point). If a girl is secure in their sexuality, then no hurt feelings, but if a girl is not comfortable with their sexuality hurt feelings ensue.
Just to make it clear, I don't care about who people sleep with, that is their own fucking (pun intended) business.
The real defense to "hurt feelings" is thicker skin. Which can be learned. But instead, we've become a society of victims of "hurt feelings" and the outrage that is a result.
What is real, is that troll exist. Have existed for ever, and will exist into the foreseeable future. It would be much better use of time and energy helping people ignore trolls, than letting them get the best of us with their trolling.