> We already set the precedent that a business cannot refuse service for customers it finds objectionable.

Incorrect; we've already established in law a small set of narrow protected bases of discrimination in public accommodation. Outside of those categories (or in business relationship that are not within the scope of public accommodation, regardless of basid) a business absolutely can refuse service to customers it finds objectionable.

Discrimination based on advocacy of race-based violence does not, it should be noted, fall into any of those protected categories.