Humiliating someone for not knowing something is not a good way to communicate and it poisons the local environment. It's much better to respectfully offer correct information.
https://news.ycombinator.com/item?id=29679505
The culture I would like you to try for is one in which people don't feel comfortable questioning (or, rather, vociferously protesting through abuse of the flag feature) the validity of posts celebrating the lives of black luminaries. In general, the level of soft racism on HN is disheartening and certainly warps how I tend to respond. I join you in wishing that I didn't feel the need to mirror a lack of extended dignity with indignation.