Pls explain I’m new here lol 😵‍💫

A video of younglo verbally berating an eyebrow-less narally popped up on my tiktok & my first reaction was who tf are these people. This sent me down an hour long rabbit hole that lead me here (I love reddit)

Can someone PLEASE explain who these people are wtf do they do and how / who Lexi is. Is this real? Is this satire? Are the mentally ill? There is so many videos I fear I’ll not sleep tonight if I go back to the beginning but hoping someone can give me the cliff notes on this … situation? Thank you lol