Is it some sort of a conspiracy here to not discuss this that I am not aware of? Or is discrimination towards some OK but not towards others?
"Please avoid introducing classic flamewar topics unless you have something genuinely new to say about them."
You didn't engage with anything specific about this story. You only raised the most automatic and generic and obvious of objections, in an outraged tone. That's precisely what that guideline asks you not do to.
Moreover, you got some really thoughtful replies that (agree or not) were clearly trying to answer you meaningfully. But you responded with more automatic dismissals (e.g. https://news.ycombinator.com/item?id=9893128). That is not substantive discussion. I'm impressed (edit: and grateful!) that frankdenbow and the other users replying to you stayed as respectful and thoughtful as they did.
HN is a public forum; the public is divided; we can't expect everyone to agree. We can, though, expect you to actually engage with others, with the real problems they're working on or facing, and ask questions and listen to replies in good faith. Respectful disagreement on a divisive topic is hard enough when people do meet this standard; it's impossible when they don't. One violation can blow an entire crater in the discussion. Please don't do that again.
It would be insane in a place where discrimination based on gender/age/race hadn't been a thing for so long that it substantially distorts all aspects of society.
However, the place where its actually developed and focused isn't that kind of place, so that doesn't really matter.