I don't really care about negative rep at all. I still find it interesting to read the message that was written. The only kind of rep that I don't really like is if it either doesn't say anything or if it is completely stupid. I think one time a got a negative rep just saying "asshole" because I said in a post that I didn't care that much about post count. <_<

I think that people can give positive or negative rep for any reason as long as it's appropriate. Don't post something when giving rep that you wouldn't post in a VM or an actual post.