Echo chambers may not be nefarious, but they are insidious.

They can be if they're involuntary and inescapable, but neither is the case for Twitter. It's designed around letting you curate your own feed, but it also constantly throws random stuff in through retweets and quote tweets - which is what people hate the most about the platform.

I don't believe discrimination is nefarious - there is no hidden agenda involved. That's just how societies work, it's natural behaviour - to belong to a group they identify with and to keep out strangers and weirdos.

This comment likely violates the guidelines both in form and content.

I don't believe repeating someone's comment nearly verbatim is as clever as you want it to be, nor do I believe recommendation algorithms are equivalent to the kinds of societal discrimination you allude to, nor would any reasonable person.

Instead of trying very hard to be clever, please next time try just as hard to make a valid point. I know it can be difficult when you think you smell karma in the water but do try.

The echo chamber in your first point does the suppression in the second.