I meant drivel. The linked post starts with:
> So, I went with, “fuckyourwhoremotherinheronegoodear.”
Drivel is "childish talk" (mom insults, anyone?) http://dictionary.reference.com/browse/drivel
As to your other points, I think they are good. For me, intelligent debate does not talk about fucking anyone's whore mother in their ear. If that is what I was looking for, I'd read YouTube comments.
edit: admittedly, tptacek does have a point re: the flag button vs. blacklist.