Governed by rules, yes, but not so strict as to resist change or so esoteric as to require such fervent pedantics. After all, written language is speech made into symbols, not outright invented independently. I still can't figure what the use is in lecturing a person on spelling. Are we concerned for the person's job prospects? For his standing in the world of online discussion forums? This from someone who "doesn't want to be a nazi" about spelling. If that's the case, why correct the commenter at all?