I think people are too sensitive.
Discussions, whether in person or on ananonymous forum, should always be positive if contributors are allowed to express their views/opinions and are able in return to recieve criticism/feedback/education (however you want to describe it).
The problem is that a sensitive social culture breeds defensiveness and therefore emotional reactions are commonplace.
You can call me "Big nose".
I can reply "How do you define big and is that a complement or an insult?"
or "thanks very much!" or "You're not so bad yourself conkface!"
Or I can do like most people do and react emotionally and fuel the animosity..........
Discuss!