If I was with you you could count on me to cover your back. And with those hippies it wouldn't take much.
In the least, you should have laughed in their faces and just say they are showing exactly what they are all about in supporting a murderous totalitarian bastard.
And then you could tell them, since you know what they are all about, you would do whatever it takes to stop them from ever succeeding here.
And I would be with you then too.
If I had been at their table I would have said something. I note that folks don't risk life and limb in rickety boats to get IN to Cuba.