No, he's right. They ain't playing, they're working. Everyone else is playing.
Actually, I think you have hit on one of the main reasons why most non-delusional fans react negatively to LaRussa in such a visceral way - he is utterly humorless. He is a fun sump. Any room, jail, stadium he enters, good feelings evaporate the moment he walks in.
I couldn't care less about LaRussa usually, but do take some solace in the fact that even when he wins, he has no fun. He is incapable of joy.