Well, I don't really hate it. It's just a personal thing. A silly thing, really. When I first got into recording, the whole world was telling me how great ProTools was and how magical it was and that it would save my life. Plus, it's the "industry standard." I really wanted it but I couldn't really afford to buy the LE bundle.
The first piece of recording hardware I bought came with Cubase LE, so I grew fond of Cubase. When I finally did get a chance to play with ProTools I was so disappointed. It didn't do anything special that Cubase couldn't do. And for whatever reason, it was really weird with exporting/bouncing to disk. It pretty much had to play the entire song while exporting and I couldn't export single tracks. I had to go and mute the tracks I didn't want exported and had to wait the entire length of the track for the export. That I actually did hate, and I said it out loud. Anyway, word got around that I "hated ProTools" and I became known as "the one who hates ProTools."