I have to agree with OP as I have experienced the same thing, not just on the Internet but throughout my life. It is worse on the Internet due to lack of visual and auditory signals that we would normally use in a conversation.

However, there are MANY people on the Internet who do not even bother to read your post properly. They don't even understand what you said, yet they get nasty and jump all over you.

It is worse for me because I am overly sensitive to rudeness, ignorance and arrogance. Which is why I suffer Socially Avoidance IRL.

I still think the real question is why are there so many ^%&holes in the world?