It is possible for one to group somebody outside our Dunbar number and not be a douche[0]. Empathy is not as strong for people we don't know, but it is still possible to have it (or even convincingly fake it as many on the Autism spectrum[1] do).
In fact that empathy is what allows normal conversations to occur "in the real". That people lose that empathy online isn't surprising, they are talking to a screen, after all. But I also believe that those who can see past the pixels and into the virtual eyes of the person they are talking to make better real-life people. It also makes for much better conversations[2] online.
0. I'm going to go Godwin here just by saying I'm going Godwin here. You know what I mean!
1. My wife works for a pediatrician and has told me they are no longer considering Asperger's as its own syndrome (disease, disorder, I always get those mixed up); it is just a place on the spectrum. I have no separate source and just thought it was interesting. I also realize trusting what a single doctor says is a really stupid move on my part, so please feel free to shred me.
2. If for no other reason than you don't have to read a bunch of self-effacing, defensive crap, such as I wrote in the above footnote.