If you call youself a fascist then I would take that as intent to support fascism.   Now who is quibbling?   Lol

It doesn't mean you can arrest them certainly, not without a criminal act.   It does mean you can argue with them and call them as you see it.

I do not support Antifa.  But it is no surprise the threat of weapons for civil strife is seen central to those fascist groups like Nazi lovers and some of the so called paramilitary groups that call themselves 'patriots'.  

The threat of weapons is a good sign of the weakness of the ideology that can't stand on its own.   I take such threats seriously.