I don't think "antifa" consists of a majority of "people of color".   They're a confusing bunch and don't exactly seem well organized but at least they don't seem racist.  

They seem angry and they are often violent.   They are also ill-defined.  I'd probably be called "antifa" if I had shown up in Charlottesville with a sign that said "It belongs in a museum" (referring to the statue of R.E. Lee).

I think many are anarchists.  Can you even vote Democrat and claim to be "antifa"?  I think hardcore antifas would disagree.  

They've existed for years and have never had a clear message except they hate those with wealth and power so they burn things in the street and smash the windows of their local Starbucks but they'll probably buy coffee there again as soon as it re-opens.

BLM is NOT "antifa".  "Antifa" are extremists.   They are violent.  And they are confused.  And not everyone who protests is "antifa".