Can I add to your advice, Frank - after a personal experience yesterday - that arguing robustly with trolls is likely to get you into more trouble, so don't. Just report or block depending on the issue. I was given a warning after a nasty disruptor (using fascist imagery as well) reported me for challenging him and my post was deemed offensive too, before the disruptor was indeed suspended!
"Don't feed the trolls" is a standard lesson we learned on Tw@tter, but I forgot it yesterday. ?