Earlier quoted context omitted.
While on HN, you can feel the general air of acceptable ideas. Sam Altman is not concerned that a leftist can't have a sane discussion on this website. But he IS concerned that a bigoted racist can't be openly bigoted at work. Weird. I wonder why it is that Sam Altman is so concerned about the rights of bigots to be openly bigoted? Definitely couldn't be related to his relationship with Peter Thiel. No way...
I don't see left agenda oppressed on HN. E.g. posts about universal basic income, allegedly a rather left-wing policy, appear here often, are highly upvoted and, to my mind, discussed in a quite civil manner.
I've found most of HN willing to dive fairly deep on any topic as long as you remain respectful and don't present your self unwilling to actually reconsider your opinion. The problem is that all too often, assholes don't realize that how much an asshole they are comes across very clearly in how they present themselves or their ideas, and many people don't like interacting with assholes. The other problem is that we're all assholes sometimes.