Because he has quite a bit of breadth to most of his opinions, but most politically inclined people who listen to his arguments (see: most of Atlas) can see that there is no depth - only talking points. Defending our resident segregationist troll doesn't help either.
Exactly. Atlas really doesn't like his talking points infecting all our threads dedicated to Think Progress headlines.
It's not even that. What irritates me is that he tries to pass off actual right-wing views and moves to the right of the general consensus as "moderation". To be honest, he's not a "horrible person" - it's just that he's more of a Kelly Ayotte than an Andrew Cuomo (which I find honestly more irritating than actual moderate heroes).