LOL, well, I didn't intend for this thread to just be a forum for random ranting.
I agree that in everyday conversation (and even in formal writing), there certainly comes a point when it's more trouble than it's worth, and even counterproductive, to be concerned with grammar and spelling. After all, the point of grammar is clear communication. Bad grammar can and does cause miscommunications, and I think we'd all agree that that's not ideal, especially in formal applications like law, politics, or journalism. Imagine the ensuing mess if a congressional bill were to read, "Affordable healthcare for our citizenry is the United States' penultimate priority and we should budget accordingly."
I think people take this attitude ("it doesn't matter as long as we both understand each other") too far. You (collectively; I don't mean you specifically, tZer) may think it's acceptable to write lazily on an internet forum, or in an internal company email, but then many people wonder (noisily) why they're not getting paid "what they're worth," etc... There is a causal relationship. I hope this makes sense.
Frankly, I'm not offended by the term "grammar Nazi," even though I was raised Jewish

Decent grammar (and flawless spelling, especially in the spell-check age) are appropriate expectations for adults.