Ooh, you cribbed some Latin words from the Interwebs!  Fancy!  Too bad you know nothing of logic or rhetoric.

Like “appeal to authority”, argumentum ad hominem is only an informal fallacy; unlike formal fallacies, there are situations in which these are not fallacious at all.  For example, whereas you have repeatedly shown yourself to be willfully ignorant and ineducable, it is not a fallacy to point out that achow101 is an expert (he is) and you are a doofus (you are).  He is right.  You are wrong.  Quod erat demonstrandum.

That’s not the most rigorous proof I’ve ever made, but it’s more than you deserve.  So, get lost.