He did not make that claim that > "He was making an unsubstantiated claim that his coworkers, or at a minimum the sex and/or races they belong to, are inherently deficient at performing the work" He only claimed that the difference between groups could come from something else than society. To deny that is a much harder argument which could only be proved to exceptional evidence. Basically he's saying 'some' and you say 'never'.

AFAIK the IQ difference between genders is negligible, but the spread of the IQ is much greater in the male group. This also means that there are more men who are above 130 IQ then women which is kind of necessary to be a programmer. This does not mean that a female can't be a genius! If you want to disprove this you can do two things: 1., Prove that the average female IQ is way higher than mens. 2., Prove that there are as much women who are intellectually retarded ( sorry, English is not my first language, I don't know a better word ) than woman.