I have no problem with the odd typo, as that's an innocent mistake. What does bug me, especially on forums and FB where text space is not limited, is that people seem to think it's okay to write like they're 6 years old and using a mobile phone for the first time. FFS, you've got a whole keyboard in front of you, so there's no need to drop the vowels to make a word shorter! In all honesty there's no excuse for bad spelling either unless you're in a desperate rush, as all browsers now can now be enabled with a built in spell checker which quickly picks up any errors. Or there's even Google if you really get stuck on a word.
So yes, I judge people, and I'm fairly comfortable in doing so. Not sure if that makes me a bad person or not.