Once upon a time, there was a group of people who felt that their society was going downhill in a hurry. These people loved their society and were very sincere and earnest in their desire to correct the errors they perceived.
So they rededicated themselves to promoting the society's older and proven values -- or at least, what they considered their society's older and proven values. They loudly and publicly condemned anyone who strayed from their version of Truth. They assembled and organized their followers and spread the word of ethical certitude, divine grace, and the enemy's lack of both.
They loudly proclaimed, "We are the voice of correctness!"
And then one, and another, fell short of the league's principles. The people they hoped to guide to a better world began to suspect them of calumny at least, if not outright hypocrisy. Because a few failed, the entire group was subjected to public humiliation. A humiliation that may have been deserved, but not because some members were flawed. A humiliation deserved because of hubris.
It turned out their values were higher than their character. Which isn't a bad thing at all, unless you're holding someone other than yourself up to your standards.
Moral: If you want to criticise others for bad spelling, incorrect grammar, or atrocious similes. Make surre you never make a mistake in doing so. (And yes, I saw the double "r" in "sure.")