Associate their business? They’re a service company. Getting paid to serve people food isn’t “associating.” Does Chik-fil-A refuse to serve gay people based on the company’s beliefs?
I could understand if this meeting or gathering was centered around ideas that they didn’t believe in or if the people were openly criticizing the workers for their lifestyles, but searching the groups website and refusing service based on their political position, and that position has no effect on the service, is a bit extra.
If you’d serve these people and never know their beliefs without asking, then you should just serve them, not go and do a background check on them.
That's precisely the point. They presented themselves as an organization wanting to do an event in the restaurant, not as individuals. There would've been no way for the restaurant to know about their opinions had they booked as any other regular group of individuals, but they booked as an organization who wanted to have one of their events there and who has made its agenda clear and public. The restaurant doesn't align itself with the political opinions of said group, so they can refuse to be associated with them. And yes, it is associating, all the group had to is put some pictures up and boom, now the restaurant is seen as a place where anti-LGBQT and anti-abortion groups are welcome.
I'm not 100% sure, but I'm pretty confident that anti-discrimination laws protect individuals, not organizations. Organizations de facto have a political agenda, AND they make it public beforehand. If you don't agree with said political agenda how can one force you to host that organization? And yes that goes both ways, I wouldn't expect say a church to agree to host a LGBQT meeting for example.