Hi NC. Mean posters are rare, IMO, but do temporarily leave an ugly mark. Stink the place up a bit. It's generally someone who is perpetually cranky, unhappy, powerless, wounded or insecure. Have you heard the phrase, hurting people hurt people?
People hide behind screens. (Ha - remember the Wizard of Oz?) I remember taking an online college class. A guy named Mike was in two of my online classes and he routinely sniped, growled and put down ideas and comments from students in the classes. Mike was also outwardly disrespectful to both instructors -- Ph.D in Psychology and well-known mediation attorney. Of course, although we never met Mike in person, we all developed opinions about the illusive Mike. My last class was offered via in-person; classroom. During first-day class introductions we met the famous Mike. There he was. Scrunched down in the back of the classroom offering no eye contact, giving the appearance of a mousey character. Rarely heard him speak the entire semester. Lost his bark. That was an eye opening experience for me. I think about Mike when I read some of the usual suspects' rude and negative comments on the Q boards. They are 'Mike' to me. Nothing more.
I understand what you are saying, NC. The mean comments remind me of the anonymous SLAM Books that floated around middle school/junior high hallways. I remember reading this about myself -- I was 'the girl with the dead mother.' She passed away Easter weekend, 7th grade. Cancer. I think it took two weeks for that phrase to surface in the slam book. Anonymously, of course. Dark hearts.
"I took a walk in the woods and came out taller than the trees." Henry David Thoreau