Why teenagers these days are so toxic?

Hi im in 10th grade All my classmates are like sooo toxic, they judge each other, make fun of peoples body, and etc. And there is this chubby girl in my class who is innocent but like this guy in my class making fun of her saying stuff like”Hey yall hearing this? IT AN EARTHQUAKE! SHES RUNNING” and stuff. I get make fun of them too cs im too skinny they call me the skeleton and other words. Can yall help me? Like some comebacks or anything.