The way I see it is: If it's a one on one situation, a single act of abuse (in most cases) would not constitute as harassment. If, however, a person receives the same amount of abuse from multiple people in targeted effort, that's harassment. In other words it mostly depends on volume on the receiving end, rather than the other way around.

In regards to cases involving staff members, these will obviously involve bias, especially in such a small community. Can't do much other than accept it.