abusive or insulting online is called
a "hobo" because it rhymes and its insulting.
No, WikiAnswers is not that sort of a site. We do not support nor participate in cyber-bullying, which is what you call insulting someone online.
It is an insulting term for someone who is a Roman Catholic.
Social bullying is verbal insulting someone or threatning someone.
Calling someone spineless in an insulting manner refers to having no backbone or being cowardly.
Embarassing or insulting someone with no provocation.
Yes.
The abstract noun for rude is rudeness. Someone who is rude or insulting can also be said to exhibit impoliteness.
Draco called Hermione a mudblood - an insulting term for muggle-borns.
There is nothing insulting about the name Matthew. Someone might be annoyed, however, if you called him by the wrong name. People generally like to be called by their own names.
Saying that someone is yellow (a coward).