It'd be more realistic to consider all the ways in which the saying "cripple the bitch" would make Nightwing do things that he might or might not prettily angst about after all the violence is done. Still, not quite the point.
Overall, I think I'm not that bothered by the anti Dick/Babs thing (I mean, I think the rants show a questionable understanding of their characters and relationships, and hate comms are a waste of bits, but whatever people do in the privacy of their comms...). "I think she mistreats him, and he deserves something better" (had it been politely worded) would have been, I guess, ok (even if I'd be rather vocal arguing against that *g*).
No, what makes me think the whole thing is too ugly to be spontaneous (so I'm more icked than angry) is the "cripplethebitch" thing and the related stuff. There's character dislike, and there is sociopathic ranting. The mysoginistic violence in that -and I'm saying this as somebody who thinks comic books violence can be pretty sexy (cf Cass, Shiva, et al)- is utterly appalling. Babs was *crippled*, and, at least in the narrative framing, *raped*. You can (theoretically) not like her, but to gleefully say something like that... That goes beyond well mannered energetic fannish dissent, much in the same way in which a thing goes way, way, *way* beyond another thing.
I'd be glad if we never cross paths with that one again.