Please don't use that whataboutism here.

But, since you asked, businesses that offer services to the public can refuse service to anyone UNLESS they're refusing a member of a protected class, for being a member of a protected class.

White restaurant owner kicking out a black lady because she's belligerent/drunk/whatever -- fine.

White restaurant owner kicking out a black lady because she's black -- not fine.

Religious bakery owner refusing service because it's Monday -- fine.

Religious bakery owner refusing service because the customer is gay -- not fine.

But again, please no more whataboutism.

Don't. That is a completely separate topic. Not to mention that, in the state where that happened, sexual orientation was a protected class.