I've heard if it gets so many downvotes it'll become a low-rated comment

It depends on what it is like: "advertising" "repost detected" "not funny" "downvote" "that's fake" etc.

Got it!

It becomes low rated if they are toxic or if you are in the politics stream, have a different opinion

Lol ok

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.

Oh, ok

it's just downvotes, if they have a ton of downvotes, then they're comment becomes a low rated comment

Ok!