I think though this points to an architectural problem with the multi community link aggregator/forum concept. Fact is, when you have a site that allows multiple communities to coexist and bleed into one another some won't get along, some will harass each other, it probably always results in things like this, then you get echo chambers. I think forums and single community sites (possibly even federated) make a lot more sense to prevent interaction from devolving into this. The model reddit based their business on has obviously failed the user at this point. It was a Utopian (and profitable!) dream to be the site for this sort of thing and it was short sighted in hindsight.