Ctbing isn't natural selection. Many people overestimate biology, they deal with stuff like evolution and genes as if its a god that choose the better which is actually a misconception. There is no true direction for it and it doesn't seek to eliminate people based on what they think its bad.
Even if we assume natural selection is an algorithm to bring the best: This algorithm is impossible to reach its goal, which means sometimes it will keep whats considered a worse state or trait.
Additionally, rejection by society is a different topic. "Society" is a type of herd mentality. Its not necessarily biological and it could be done by environmental factors or indoctrination.
I respect ctbing. The biological phenomenon is shitty and humans are intelligent enough to expose it. Their pain and suffering isn't natural selection, its because of the stupid biology. This stupid biology creates a body with an inevitable death and even the species extinction is inevitable, which clearly shows how life is a trap and people should stop glorifying life and the shitty biology.