I think that this article is fantastic. It highlights what is wrong with all the political correctness going on. To an extent, it is necessary. People shouldn't be made to feel bad about race, gender, or sexuality, but once you start to coddle them, you aren't helping them grow as individuals. People in the real world will treat you like crap, no matter what.
> People in the real world will treat you like crap, no matter what. Why should we accept this?
>Any person capable of angering you becomes your master; he can anger you only when you permit yourself to be disturbed by him.
-Epictetus
To answer your question, we should accept it because that is the way reality is fundamentally. Go ahead and try to eternally fight to erase all darkness so that there is only light. Spoiler alert: it's impossible. If there were no darkness there would be no such thing as light because light implies the presence of darkness and darkness implies light.