He used the word ‘papist’. Anti-Catholic bigotry or common usage?
Just a bit of self-deprecating humor.
It's analogous to the way the Society of Friends wryly adopted the originally-contemptuous word "Quaker" --- or we proud Southrons will ironically call ourselves "rednecks."
Besides, Thomas Peters (CatholicVote) also has a blog called "American Papist." So he uses this term for himself--- and entre nous
He used in relationship to Rocco Palmo's blog. Palmo is a self professed authority on anything papal.
Tom Peters has long had a blog called “American Papist.”
He’s appropriated the term “Papist” the way the Jesuits appropriated the (derogatory) term “Jesuit.”
Dittos to what the others have said, with the added thought that there are so many "cafeteria Catholics" who pick-and-choose which doctrines they believe and which moral teachings they accept (e.g., contraception), that a Catholic may call himself a Papist as shorthand for saying "I accept the teachings of the Catholic Church on all matters of faith and morals."
In that sense it becomes more "common usage" for faithful Catholics.
On the traditional wing, it also becomes shorthand to distinguish traditionalists who accept Vatican II and the popes from John XXIII through Francis from sedevacantist traditionalists who reject Vatican II.