Your interest in the content they host has zero relevance to the technical challenges they face as a platform and heavily trafficked website.
Unfortunately, biases are rarely so blatant. Many are even non-malicious and entirely unconscious, like how people tend to guess older ages for black youth than white youth. http://www.apa.org/news/press/releases/2014/03/black-boys-ol...
I still say they don't represent the technical community. And it's blatantly obvious they don't represent the HN community, given the downvotes.
I'm not saying there aren't biases, sexism, ageism, or racism in tech, but I'd appreciate it if you didn't point at the obvious troll and say "this right here is the face of tech".