Because you have to waste time reading it, and because they tend to force people to sugarcoat everything they say so that someone doesn't get "triggered" [1]. They also encourage SJWs (social justice warriors) to waste other people's time with various crap, for example the Node.js pronoun scandal [2].

[1]: http://geekfeminism.wikia.com/wiki/Trigger_warning

[2]: https://www.joyent.com/blog/the-power-of-a-pronoun