Let's use an analogy:
Someone is hiding behind a door, a fence, a window, whatever, hurling insults and abuse at passers-by, maybe not all passers-by, just the ones that they have singled out. They are doing it from an anonymous vantage position. Their abuse is offensive, insulting, completely off the wall, false allegations, and they are joined by numerous others who add to that abuse, leading to a cacophony of insults and offence. It becomes a wall of offence aimed at specific individuals every time they appear in proximity to that closed, secreted, vantage, anonymous position.
Would it, should it be tolerated?