I feel the simplest course of action that anyone can take about this ruling is anytime a business chooses to utilize it to discriminate, we all band together and boycott their businesses in the name of gay rights.
Anti-trans folks famously boycotted Bud Light and it worked. They lost a lot of money. If everyone that supports gay rights told homophobes, who discriminate against gay people, that they don’t want to partake in their business, it would send a pretty clear message that hate doesn’t pay.
Money is what these people care about. Hit them where it truly hurts and make think twice.