What complicates things with DNR is that sometimes a response, or a response to a response opens up something you want to discuss.

Avoiding geting into threads started with evident flaming or trolling intent is not that hard - but when a good thread gets invaded by someone intent on stirring things up in a damaging way, there still may be a discussion going on you want to join in with.

What I try to do these days is, once I have identified someone as a person who is more likely than not to be a troll or a flamer, I try to go right past them, and itnore their existence. And if I ever want to respond in any may to something they have written, for example when it has been picked up by someone else, who has with something to say, I find it's easy enough to avoid making any direct referance to the T or F.

Unnamed GUESTs generally go on my list of posts to be scrolled past unread. That may mean I miss some interesting posts that aren't intended as destructive, but if we use the same name as some extremely nasty people, an inevitable consequence is that we are likely to get confused with those extremely nasty people.