Having been there since the pre-Digg days, I simply hate what they're doing with the place. It hurts to see something you've enjoyed and contributed to over the past 20 years become the antithesis of the free and open internet it once represented. Every change they made to the site since they tried to migrate off the old.reddit.com interface has been a negative one for the users. The sudden acceleration of those kind of changes has made the site both unreadable (content is beyond stale now) and worthless to participate in.
I think for me, this disappointment turned to real visceral antipathy when I saw this page - it looks like something the CCP would design for kindergartners. It's not a place I want to be a part of at all, and I don't want my past contributions to fuel it.