While he doesn't always come off very well here, I think you're being too hard on him. He states outright in his earlier linked post[0] that he would prefer that modified gravity were true. He's at least familiar with TeVeS: I watched a video of a lecture he gave where he went into a fair bit of depth on it (i.e. way over my head). And he also seems to have done some small amount of modified gravity research himself (linked at the bottom of [0]).

My takeaway was that since the CMB spectrum seems to require dark matter, it's going to be there even if some form of modified gravity is also true. I've barely heard either side of the debate mention this in layman contexts. What's the modified gravity perspective on that?

[0] http://www.preposterousuniverse.com/blog/2011/02/26/dark-mat...