Is a lot of the diamond hate because of the people that wear it or the actual product itself
Both, mostly people though.
Nick's business is booming. A couple years ago, you could only find a couple pieces from each season in Zumiez. Now, you can basically cop most pieces from there. They have tees, hats, hoodies, everything really. And that means more people being exposed to it and Diamond is now seen in a lot of places and a lot of kids are wearing it, and that bothers people cause they think they're superior to others. Zumiez doesn't have exclusives, so the superior folk should just stick to exclusives and buy the few GR tees that aren't sold there if they're so worried.
And the product itself cause the designs have been lackluster for the past couple of seasons, or so I think and many others think. They're starting to pick back up, but I personally haven't bought much Diamond this year (other than old gems on eBay) simply cause the designs were just horrible. The exclusives were cool though so there's that.
I'll always support Diamond though and I'm glad things are lookin up again