Rereading that post, I should clarify - I do think that there is some bullying on MN, just I haven't personally been on the receiving end.
Here are two definitions - for the workplace, so written for adults. How do you use that on a site like MN, where difference in opinion is a main part of the site?
Definition of workplace bullying by Amicus-MSF trade union
"Persistent, offensive, abusive, intimidating or insulting behaviour, abuse of power or unfair penal sanctions which makes the recipient feel upset, threatened, humiliated or vulnerable, which undermines their self-confidence and which may cause them to suffer stress"
Those who can, do. Those who can't, bully.
"Bullying is a compulsive need to displace aggression and is achieved by the expression of inadequacy (social, personal, interpersonal, behavioural, professional) by projection of that inadequacy onto others through control and subjugation (criticism, exclusion, isolation etc). Bullying is sustained by abdication of responsibility (denial, counter-accusation, pretence of victimhood) and perpetuated by a climate of fear, ignorance, indifference, silence, denial, disbelief, deception, evasion of accountability, tolerance and reward (eg promotion) for the bully."