After writing this out, I understand how autistic it sounds. I really do. I still can't help myself.

There was once a bunch of people who got together and tried to develop a realpolitik style sexual strategy uninhibited by mainstream thoughts and dogmas (muhsoggyknee for one). They called this realpolitik style sexual strategy "red pill". They called things opposed to this newly created sexual strategy blue pill. For example, red pill states that one should be very cognizant of potential romantic partner's sexual history as it reveals a lot about them - blue pill states that there's no difference whatsoever. Red pill states that if a woman doesn't want to do what she used to do with her previous partners, chances are that she does not feel the same for you. You can only guess what blue pill states.

In came a group of SRS/feminists tumblerinas DOXers who cannot stand existence of any space that does not pay a blood tribute to the parasitism that is feminism and "female friendly spaces". In a fit of irony, or more likely because they have creativity of a retarded sponge, they decided to name their cute little dox-central The Blue Pill.

While blue pill is unconscious, passive indoctrination into female imperative, The Blue Pill is representative of that very same aggressive and fundamentally evil force that makes this indoctrination possible.

To recap, blue pill is anything unaware of TRP's sexual strategy but opposed to it due to ignorance of it ever existing in the first place. The Blue Pill is another feminist dominated echo chamber.

After quite a while, people not liking TRP's abrasive tone but not liking the "omg feel outrage at THIS" decided to form this very sub to actually debate without having TBP's style echo chamber or TRP's abrasive tone. Folks who are sane (and I define this as not hard feminists like majority of TBP forum is) but not entirely on the red side, and want to debate with words and logic instead of endless outrage spirals and virtue signaling and witchunting and whatever it is SJWs. Those people are purple pill-blue flaired - aware of TRP, and in a non-TBP disagreement with it. It might be odd to call a strain of blue pilled "purple pilled" - as if there were both blue and red, but a TBPer isn't even capable of anything but irrational brain spasms when it comes to ideas that might endanger their own carefully constructed reality. That a person is in actual disagreement with TRP and is willing to debate it instead of circlejerk around it, means that this person took another step towards TRP and away from TBP.

To summarize :

blue pill: opposed to TRP because it's not aware of it

The Blue Pill: classic SJW trope only in anti-TRP flavour

purple pill-blue flair: opposed to TRP but not in a TBP way.