Maybe. But then, it takes a long time for me to become friends with someone, like d4wg, though shared experiences, trust... really getting to know someone. People shit me all the time, so if the person shits me online, i doubt i'd go out of my way to meet them, but if i did, i'd give it a chance.
However, if i really dislike someones online persona (different from my interpretation of someone shitting me), i won't make an effort, because they would have consistently shown me, via posting, that they're the type of person i wouldn't want to associate with in rl. Even if they weren't being nasty to me, but to other people, i wouldn't want to know them. For me, i don't want a friend that intentionally posts nasty things about other people. Stirring up a debate, i'm all for, but being rude for the sake of it? Fuck off.
Like UAN said, sometimes people can come across differently online due to the whole "no ton" issue, or they have trouble transferring their thoughts to text, and can come across as unintentionally rude, or whatever. I understand that. They're not the people i have an issue with.
It's all relative though.