I’m sure someone could do worse, but my idea of the ultimate put down is:
You’re incapable of understanding the truth.
It’s saying that someone is both wrong and irredeemably wrong.
When looking at the pathological thinking of birthers, one is invited to compare and contrast it with Obot thinking. Comparisons are easy: vehemence, confrontation and argument; however, contrasts are more striking with the birthers holding fringe views and the Obots consensus views. The birthers rely on their own authorities and their fringe reading of the evidence; Obots rely on mainstream authorities and expert reading of the evidence.
An essential contrast is how birthers and Obots view each other. Typically the birther believes that Obots disagree with them for a number of reasons (refusal to look at the evidence, dishonesty, partisanship or evil intent), all of which could change. Birthers believe that the honest person who gives them a fair hearing will agree with them, and this is reflected by their continued attempts to prevail in court. The fact that their cases are dismissed is not attributed to the fact that the courts disagree with them, but because they are corrupt. The firm birther hope is that eventually almost everyone will see it their way. The birther view is based on optimism that it is only a matter of time before the tables are turned and they represent the consensus view.
On the other hand I believe that the birthers will not change their minds if they give a fair and patient hearing to what the Obots have to say. I believe that they are incapable of comprehending any opposing argument, and that trying to convince them otherwise is a futile gesture. I firmly believe that they will never see it my way and I am pessimistic that any birther will change. I base my pessimism on the academic writing on conspiracy theories (which I continue to study) and my anecdotal experience on this blog.
Of course birthers and Obots have views that suit their desires, belief in change (birthers) or belief in the status quo (Obots). To date, the Obots seem to be right, and barring some cataclysm (like hyperinflation in the Weimar Republic), I don’t see the inmates taking over the asylum, and put down or not, I believe that the birthers are incapable of understanding the truth.