@ghost-of-a-dukesaid I have also seen anti Christ used to describe atheists, but think that is a bit of a stretch. Most atheists are not 'anti' Christ in any meaningful sense. They just don't view him the way theists do.
Jesus being Lord has those that acknowledge Him as such, and those that don’t. The trouble with those that don’t fail to realize He is Lord regardless of their point of view. Even in human terms when there is a ruler king who has those who oppose his rule, that automatically means they are rebellious, against deity its worse.
She even quoted scripture to justify why she mocks fellow Christians in that particular way. Putting the word "Christians" in quotation marks is, for her, "resisting evil" and, apparently, she will continue to do it "as long as [she] can stand upright".