Hmmm.... somehow I have never encountered this before. I am not a redhead myself, so that does not make it too extraordinary that I would not encounter such things, even if they were going on in my area. But I have really never heard of this redheads not having souls nonsense before. I have, however, tried to avoid morons most of my life, so that might explain why I have never heard anyone say such a thing before.
"A wise man ... proportions his belief to the evidence."
— David Hume, An Enquiry Concerning Human Understanding, Section X, Part I.