Unjust stereotype, but some of the malicious things people say makes one wonder.
I honestly believe it's only a small part of the internet community.
Take a celebrity's Twitter for example... I guarantee most of them get thousands and thousands of positive tweets daily. But, do they respond to those? Very rarely. However, they'll be really quick to respond to someone being cruel.
Even here.... let a thread in the non-spam section on WWE go 10 pages, and most replies are reasonable and intelligent. Then you have the one moron being nasty and stupid... who's going to get a response? The "troll" and then an argument starts and he gets a thread dedicated to him in the Bar Room. But, it's just one poster out of dozens of good ones in that thread, and HE gets all the attention.
The internet isn't filled with negative, horrible people like everyone tends to believe it is; it's simply we all have a bad habit of giving negative and horrible people our attention.
Even in real life, you're having dinner at a nice little restaurant. It's peaceful and everyone seems to be enjoying their meal. All it takes is one belligerent idiot to show up to ruin the experience and leave a bad taste in your mouth about eating at that restaurant. It's the same way on the internet.
Point is, try and focus on the good rather than the bad. Not just on the internet but it real life as well. I myself struggle do so such on certain days, but the effort can pay off.