You're likely being throttled because of the number of posts you're making, as well as some sort of auto-moderator system where if someone gets downvoted a lot in a short time, the system thinks you're a spammer and throttles you.

As to why you're being downvoted I can only hazard a guess - You're likely being downvoted because you're making accusations using words that have very strong meaning and implication behind their use, and don't fit well with this discussion.

Saying the mods only allow white supremacy on this website is laughable. There's no way for you to prove this - I'd like to see you try. If there was actually white supremacy in this group, we wouldn't have such a diverse group of people (intellectually, physically, culturally, geographically, etc) to come here to discuss (in most cases) tech news related to readers' fields - it's part of why the internet is as popular as it is.

People who are regular contributors and commenters to the Hacker News forum usually bring more to the table than simple name-calling and insult-hurling. There's also wonderful ideas you can try yourself like critical thinking, opening your mind to other opinions, stopping yourself before making baseless accusations, etc.! It's fun.