What is the "red pill rage"? Where does it come from? Is it a "bad" thing? What can we do to overcome it?

Intro Music: "Fling My Turds" by Red Pill Chemist
Background Music: Dark Walk by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100468
Artist: http://incompetech.com/

Gamplay: Metro 2033 Redux (on PC)