Today I figured out that when Trump says he's not "politically correct," the political part is extraneous. It means he is not correct, i.e. he lies. 

A liberal is someone who cares if something is true. A smart person, a conservative, just believes what he or she knows to be true. A conservative is not politically correct.

Facts are politically correct.  

I had this epiphany watching interviews with people at a Trump rally.

I'm still learning.