While I agree that his men's collection, for me, leaves something to be desired, I agree with Alda about what Yohji means by hating fashion "fashion". Fashion is what's popular and "in style" it has nothing to do with "style" or design or art or history or elegance.
I hate fashion in the sense that it is so forced and then gets distilled through department stores, corporations and advertising. However, I love design, cuts, fabrics and the concepts behind the designers vision.
Y-3 is really just Yamamoto giving direction and a concept to a team of designers. The result is simple fuctional clothing with a modern influence.