It is a simple way that someone gets a low rated comment. If someone is being toxic, didn't get a joke, or hating something, you simply downvote them and other downvote it, gets more downvotes than Upvotes, the low rated comment appears.
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1 up, 4y
Oh, ok
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2 ups, 4y,
1 reply
It becomes low rated if they are toxic or if you are in the politics stream, have a different opinion