I've actually defended someone on another message board for less-than perfect spelling. Someone was flipping out on this guy,
who wasn't even a native English speaker. It was over a couple of stupid things, like a syntax error and a dropped
e. The angry guy's rationale? The foreign poster should have posted in fluent English because his signature was perfect.
So I proceeded to rip apart the angry poster's grammar. He never responded to that one...
I think the problem is that most people assume that if someone types/spells incorrectly, it's because he/she's being lazy. We shouldn't assume that, but how often do you see that kind of crap? Too often. My point? Don't be a grammar nazi until you at least know the poster well enough that he'd take your criticism well.