He means that refs are ridiculous and even he, of all composed and well-spoken people, is losing his cool. Expect the Harden from that Indy game to unleash himself in the coming quarters, specifically just the next two the Rockets are playing tonight.
I think Pop is sitting Green and Leonard on purpose. They are probably studying Harden this whole game thinking up of ways to defend him.
For all the size and athleticism this team has, it's pathetic how bad we are at offensive rebounding.