i) dweeb grad students who have read too much Left "theory" but are really just liberals,
ii) liberal punks whose primary goals are keeping cryptofascism out of their communities and cooking veggies from the local farmers market (not necessarily in that order), and
iii) anarchist punks whose primary goals are keeping Nazi punks out of dive venues and cooking vegan chili from dumpster veggies (not necessarily in that order)
You will have more success herding cats than in getting that motley crew to agree on a single policy action, let alone organizational action.
That such a group have invokes for you a specter of Weimar-era Nazis is kind of embarrassing, and speaks to an utter lack of diversity in social experiences. The teen smoking weed in a Dead Kennedys hoodie down the street from you has probably has an Antifa sticker on his laptop, and perhaps he'd love to throw a brick through a Starbucks window... but that's not Kristalnacht.
Taleb btw is nowhere near as fragile as to fear Antifa as some vanguard force for e.g. Nazism or sectarian ethnic militancy. He's literally more concerned about random bitcoin fanatics.