Red pill comes from the 1999 cult classic film, The Matrix. There’s a scene early on in the movie in which the main character, Neo, is offered two pills: a red one and a blue one. The red pill represents an awakening, but one that could be difficult and painful. Neo’s world will be changed uncomfortably if he takes the red pill, but he’ll be made aware of the truth of the world. The blue pill represents comfort and security. If he takes the blue pill, he’ll continue to live in blissful ignorance.
The concept has a precedent in the 1990 science fiction film Total Recall. In that film, one character offers another a red pill, which is said to be a symbol of his “desire to return to reality.” There’s no blue pill presented, however.
Red pill and blue pill have become slang for accepting truth even though it’s difficult, or rejecting it to cling to a comfortable falsehood.It's FACT and REASON VS. FEELINGS and FALSEHOOD.