Ashton wrote: But I think that the larger majority of people really do get randomly flamed for such innocent things as "Hi, I'm new and I just wanted to say 'hi!'" Now, I don't consider this in any way destructive, or wasteful of anyones time. Do you?
You'll have to point me to some threads that are like that. I've searched every sub-forum that might have such a thread in it (excluding Off Topic and Way Off Topic, as those are the cesspools of this forum anyway, and you'd expect to find nasty stuff in such places.)
Anyway, to answer your question:
Yes, flames like that are wrong. There is no reason why somebody should be attacked for a greeting.
However, I stand by my opinion that some retorts can be well-deserved.