My personal view on this, besides empathy for you for having to deal with that, is that organized events like CBCs should have zero tolerance for bigotry of any kind, and that any person displaying such bigotry be uninvited from future events. Birding has a reputation of lacking diversity, and ensuring that every individual feels safe and welcome at birding events seems like the obvious first step towards countering that.
I briefly made a political statement to a new acquaintance at the Bend CBC and immediately regretted it, even after being relieved that he agreed. Politics should be expected to be left at home, but we should demand it of bigotry.
And if you ever want to go birding in Portland, drop me a line!