Really? What about the world being a shitty overpopulated and overcompetitive place? Too many people is a thing, but most people don't realize that and keep making babies like there is no tomorrow. Babies that will suffer more than anything in their lives. It is bad for me who was born in 1990, it is even worse for younger people and it is not going to get better, unless the population is heavily reduced, but for that some kind of disaster is necessary (since reducing the population isn't of the interest of powerful, rich people).
Also, another reason: With the blooming of social media, it became more common for people to come out about who they are. Sexuality, gender, etc. And with that, the prejudice became even louder. Not only the poor people who had to live their whole lives hiding who they were can now express who they are, but the shitty people who hate others because of sexuality, gender and stuff also get to voice their vile opinions all the time, loudly and without punishment (unless it is racism, of course — most sites don't give a damn about expressions of sexism, homophobia, transphobia, etc). As someone who is part of a minority, well, two technically, let me tell you: The world fucking sucks. Too much hatred towards myself and others for what we didn't choose to be.
Guess who are the people who use internet the most? Teenagers.