Making these claims and not backing them up is sort of lame. However, I do not deny that there may be some DIR divers out there telling other divers that they are going to get themselves hurt. But let me ask you this -- so what? If I knew another diver, DIR or not, who was doing something that I honestly believed was going to get them seriously hurt or dead, I would tell them; that's not being DIR or elitist, it's being a friend. I hope that all of my dive buddies, DIR or not, will tell me if they think I am doing something dangerous (as long as it doesn't pertain to bolt snaps).
The problem isn't with telling people they are doing something risky; it is with one's ability to judge what is risky. There are clearly some (supposedly) DIR people out there who think that the silliest things are going to get you killed. And there are those who think it's impossible to learn to be a competent diver any other way. But every group has their zealots.
I was on a liveaboard trip once, and one of the other people on the boat was a "certified solo diver". This diver was very proud of that designation, and thought that solo diving was the greatest thing since sliced bread, not just for him, but for everyone. He spent a lot of time trying to convince people that they should take a solo diver class. (Ironically, when I asked him what were the useful skills that he learned in his solo diver class that made it so worth taking, they were basically gas planning and how to shoot a bag, but I digress). Anyhoo, I came away from that trip with a lot of funny anecdotes about the solo diver, but I certainly didn't think that all solo divers are crazy proselytizers.
I don't see how it is bad to be elitist in the sense that you don't want to dive with unsafe divers. I don't think any diver wants to dive with divers they consider unsafe. Again, the problem is what some consider an "unsafe" diver. There is nothing wrong with being elitist per se.
It's like saying it is elitist not to get into a car with a drunk driver. I guess it is, but I am okay with being elitist in this way.