Well you see, this post is explaining two responses to when someone doesn't understand the content of a post. One response is an involved explanation, and the other is a brief and inflammatory rebuke. The pros and cons of each are listed below, leading one to conclude the latter is more effective.
Well, the joke is that while all the things said when calling an explanation a bad reply to someone not getting a post were true, it still doesn't show the reason why it's better than insulting somebody by calling them a dumb fuck: kindness. The arguments used to argue dumb fuck is a good reply are-
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Explain If They Genuinely Want To Understand, Or If They Can Be Persuaded To Your Side.
If They Remain Stuck In Their Rut, Breaking Their Pride And WorldView Through Psychological WarFare Is Step Two.
Or Trolling Them InTo Submission. :)