Oh, I've seen you; you are so smart you can't find the spell-check button; and if you do, you can't pick the right spelling from the list.  Not to mention those of you who are so smart you refuse to take a quoted definition from the dictionary as an actual way to define a word, but will quibble about its applicability in a certain situation.  Yes, you are so smart that you can't even be bothered to click on a link in a comment before posting a reply to review any evidence which may refute your oh-so-informed opinion.  You do, after all, know everything about everything don't you.  Matter of fact, you are so smart that anything you say should never ever be fact-checked because if you said it, it must be so.  You are so incredibly smart that any who question your so-obviously-brilliant opinion  shows they are only unintelligent bigots clinging to their ignorant beliefs.  You are so smart that you will change the interpretation of actual facts to suit your argument without a shred of evidence to support your claim.  You are so smart that if anyone dares to call you out for doing so, you know you can change the subject to dodge the questions raised and they will be none the wiser.  Being this smart, means you never have to admit you were mistaken; or worse yet--misinformed!  Being this smart means you never have to apologize!

I toast your intelligence with an old saying:

"My, my;  aren't you the Smart One of the bunch."