In that case, the appropriate conclusion is "there exists programming geniuses that are men", not "women genius programmers do not/can not exist". The conclusion that you are proposing (that people jump to) is basically the black swan problem.
But the topic is not about genius programmers, anyway. It's about competent women programmers. If you have never seen women programmers, or the amount that you have seen is not great enough to draw conclusions from, then it is unfair to jump to the conclusion that they do not or can not exist.
But the topic is not about genius programmers, anyway. It's about competent women programmers. If you have never seen women programmers, or the amount that you have seen is not great enough to draw conclusions from, then it is unfair to jump to the conclusion that they do not or can not exist.