It's not the job of your interlocutor to make your argument for you. If you can't make your own argument, you don't have an argument.
Also, what argument? Does the fact that the lady in question did not have anything to defend against, nothing to be ashamed of, really hinge on the exact definition of the shittyness of reddit trolls? Heh. So it's simply a statement. And if you disagree that such behaviour is shitty, make your case. If you don't, I really wonder what we're even talking about here.