Unfortunately, there are a number of people who have lost their mind over the issue.
I agree.
The sad thing is they won't engage you in an intelligent conversation.Just call you names which usually means they don't have the intellect to respond intelligently,or you have "Blown" them out of the water the truth and they are standing there looking stupid. So they call you names.
You are mistaken. "They" will engage you in intelligent conversation. What they will NOT do is continue to grant respect to a psychotic loon who simply keep repeating crap which have been addressed and disproved a dozen times and more.
The Loon will take anything, ANYTHING, and try to twist it into supporting his argument. He explicitly ignores statements by historical people which contradict his argument, and he never corrects his behavior when he is called out on it.
We started out having an "intelligent conversation", but it only works if there's intellectual honesty on both sides. Jeff has made a conscious decision to be intellectually dishonest, so there is no further point in being civil to him.
If you simply accept what he says, he's still oh so sweet, sugar won't melt in his mouth, but if you challenge him on anything, he deflects, he repeats, he lies, and eventually he snarls.
He is exactly like Nurse Annie Wilkes from "Misery", who starts off seeming sane, but before the plot is done, is easily recognizable as a dangerous psychotic.
Here is a depiction of him below.
Sane appearing Jeff. 
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Real Jeff.
