I think my favorite thing about Reddit is that the way people use downvotes shows how far it's spun away from its original concept. Reddit was designed in a different time, presumably to be used by people who were smarter and more responsible, because the concept of a downvote was meant to be used to hush out posts of low quality so the community could self-moderate into the right state by removing things that were thought-terminating, inflammatory, etc.
However, it's only ever used as a "disagree" button. People don't vote based on post quality, they just vote based on whether the person is saying the right things or not, and that's hilariously turned it into the perfect tool for creating an echochamber. Reddit's original designers assumed way too much of the benevolence and intellectual rigor of the people they expected to use their platform, and all they've done is build a pipeline that speedruns radicalization via its incentive structure.