Aloka wrote: ...and I wondered , do some of us unknowingly (or knowingly) hide behind our avatars and involve ourselves in these behaviours in online groups ?
I don't. You've got to be able to live with yourself, and your self-esteem is actually the way you assess yourself, as if you're another person looking in, assessing your actions and qualities. If I'm being a jerkface, that won't sit well with me or others, and I don't want that.
In other words, you might be anonymous to others, but you can never be anonymous to yourself.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)