The obvious explanation is that people were downvoting and flagging your comment because it was unsubstantive and ideological flamewar, not because they are white supremacists.

You continued to post flamewar comments. We ban accounts that do that repeatedly, so could you please stop? We've already had to ask you more than once before.

https://news.ycombinator.com/newsguidelines.html

That comment is not very constructive for discussion and against the guidelines, just like the replies. Downvoting is not censorship. https://news.ycombinator.com/newsguidelines.html

Hacker news people are usually against censorship, yes.

Just like the ACLU. Free speech is very important. If someone has something objectionable to say, let them expose themselves. Censorship solves nothing.

Says the brave man yelling at people on the internet from his chair.

I think you're doing a great job demonstrating why allowing people to expose their horrible ideas does more to dissuade other people than censorship. I'm glad your replies are on display even if I strongly disagree with them.