> Often that content is filled with blatant lies which causes the engagement (to debunk/argue) in the first place. The cycle repeats, the user reacted and then it optimises to get even more such engagement, it shows even more such toxic content. There's really no functional dislike button, you'll keep on seeing shit that aims on riling you up.

While I cant't deny that that maybe something that could be happening, in my own experience, the more pernicious problem is the creation of filter bubbles where people only see and hear view points of those they already agree with and slowly get pushed into more and more extreme versions of their existing beliefs.