You're taking the standards of a debate hall, applying them to an internet community, and then using the predictable and inevitable discrepancy to call the internet community hateful when, in fact, that's the normal level of discourse for _any_ internet community.
> I really don't see how this stance is hypocritical
Do you excuse the other side's casual use of "kill all men"? What about explicit statements that I am literally unqualified to hold an opinion because of my chromosomal makeup and the color of my skin? Those come across as equally hateful to me.
I wouldn't and don't excuse "kill all men," and I personally think that opinions should be evaluated on their own merits, and not by [x] feature possessed by they who come up with it. You're projecting these beliefs on to me because I've called out certain subreddits as being stomping grounds for emotionally charged, rather than fact based, content. I think both sides of this debate have salient points, but neither side benefits from the content coming out of /r/*hate subreddits.
Also, I find it hard to believe that "fuck that piece of shit" was ever acceptable as college-level discourse. In fact, I think that even high school level L-D style debate shies away from that tone and temperament.
If you sincerely believe that using language that appeals to emotion, over logic and evidence, is a means to an end, then we probably will not get much further on this topic. (And I really don't see how this stance is hypocritical, or indoctrinated/pushing a doctrine in any way. It applies equally to both ends of the spectrum.)