There are a lot of people who fall under those titles, who AREN'T ANTIFA.
You are broadbrushing them all under the umbrella name of something that's not even an organization, but a movement. Not all who are left wing, socialist, communist or social democrats fall under the ANTIFA umbrella. Many don't.
IMO, ANTIFA are actually more correctly labeled Anarchists than anything else, who take liberal/progressive ideas into the realm of violence which is NOT the way to go what so ever.
But if that's your idea of ANTIFA, then progs are ANTIFA I guess.
And you and other Republican types are actually Neo-Facists seeing as you and so many others are very alt-right nowadays.
Not, mind you, that I'd call everyone that myself, but if we go by your rules... all Progs, Democrats and so on are ANTIFA and all right wing, alt-right/extreme right types are neo-Fascist.
And if that's the breakdown, then yeah, there's nothing wrong with being ANTIFA.