On a number of occasions, I tried to meet with the ANTIFA Seattle folks that had my neighborhood leafleted and who were generally posting nonsense on local forums. They all refused to meet, even though I invited them to decide the venue and time. The various Twitter storms they sent my way are still online, e.g.
here.
The truth is most of them are kids living with Mom and/or Dad. Someone actually researched the topic and indeed that is what they found:
https://www.dailymail.co.uk/news/article-4200272/92-Berlin-left-wing-activists-live-parents.html
So, if you ever have an encounter with ANTIFA, just keep in mind that these folks are probably young, unemployed, broke, frustrated, and hate authority. They don't say this to condemn them, but to acknowledge that odds are good that they are in in a bad place, lost, and with little hope.
My solution was to engage with kindness, and openness. They have not bothered me since, in part because they were rational enough to see that in spite of the rhetoric, I meant them no ill will, and would be more likely to administer a hand-up rather than a beat-down.