I think that is not quite right, but the distinction is subtle. The algorithm selects the content that you are most likely to be engaged with. For most people likely that is the filter bubble, and seeing only what they agree with. But for some folks, they actively like to have debates (or troll one another) and see more content they will not agree with, because what they don't agree with gets more engagement. The intent is to keep you engaged and active as long as possible on the site, and feed whatever drives that behavior.