Why so much hate?

So, this girl's videos pop up on my for you page, and I may kr may not agree with everything she does or says, but why so much hate? She's in 12th, basically my age, and I too would like to open up a page just like hers! Makeup, skincare and everything which interests me. What demotivates me, and what makes me mad, are these people. Like why? She's just sharing what she prefers. At our age, and even beyond, there are ton of things which define or contribute to a woman's health in general. They don't know shit about it. Just because she's not slim or fair (neither am I, but I am a tad bit lighter than her), she deserves to be trolled to no end? Bless her and her mental health honestly!