Dixiecrats certainly appeared in my public school's textbooks, and I would guess it appears in the current public school textbooks.  The SATs do not have a history section, so why would it appear there?  I am less sure about the ACTs, but I do not think they have a history section.  There is what they current call the SAT subject tests, that have a US history section, which would include the Dixiecrats.  Common core does not include a history section, so would not include Dixiecrats.
The Democrats are generally very proud that the Dixiecrats chose to leave the party.
As for Antifa junkies, you hang out with a lot of junkies?  Why?