You see, sometimes debates can get a little heated. I'm sure you've experienced such debates yourself. Are you also talking about these debates, when people say something is 'stupid' but are still capable of having a rational discussion, or are you mostly annoyed by plain old hating?
The reason I'm asking is that I'm relatively new to HN, and thus can't really comment on any changes. However, I also think that in the time I've been here, I've seen some hatin', but definitely not a lot of it. Again, this could simply be because I'm used to communities where this is much more common, and haven't been able to see changes in HN itself.