I did read his posts. He never said he didn't roleplay. This is you and others putting words into his mouth so you can then shit on it to make yourselves feel better.
Grow the fuck up.
He never said he didn't roleplay, but he equated roleplaying with optimization, stating anyone who wasn't fully optimized was not roleplaying and wasn't even playing D&D. His position was unusual to say the least. I think taken exception to it is perfectly reasonable given his open hostility to non-optimized styles play.
What I think we ought not to do, is treat MR. GC as a standard representative of the optimization crowd. There isn't anything wrong with enjoying that part of the game, it is simpy a different playstyle. And you can roleplay, while being optimized(though i do think you tend to play a narrower range of characters simply because you only deign effective ones, but they can still be fully fleshed out, interesting personalities, acted out at the table).