Did you read his review?
It was one of many vocalizing the same disgust.
There was nothing disgusting about Pi, it was just weird ... in a great way.
Requiem for a Dream had a number of disturbing scenes, but they all made sense within the context of the film. There was nothing egregious.
Maybe Aronofsky goes too far in mother! but maybe not.
I've seldom agreed with Rex Reed. Even when I liked the same movies as him it was for different reasons.