The prevailing etiquette for most people is, when they're in most social settings, to avoid talking religion and politics.

In turn, I bet that restaurant owner is a typical mindless leftwing zombie. If only because of the way he dealt with the would-be customers.

If he weren't a libtard, he'd have taken them over to the side and at least quietly told him he sympathized with their situation. Or he probably would have just served them.

Liberals tend to make fucky humans because they have no common sense, integrity, ethics and compassion.