Conservative Christians are making the biggest noise. Businesses owned by Orthodox Jews seem to serve whomever comes through the door.
If you serve any straight couple who comes in, you have to treat gay couples the same way.
Should people opposed to serving inter-racial or inter-religious couples because of their religious beliefs be forced to sacrifice their faith-based principles to serve them?
There is a solution:
Abolish all non-discrimination laws for private businesses. Every business is free to serve or not serve whomever they please. No exceptions.
But some people don't like that idea. They like civil rights laws, overall. They just want the religious freedom to discriminate against gay people -- and no one else. Because gay people are immoral.
Other people are immoral as well. However, if a straight couple walks in the door, the morally uptight don't know how that couple is immoral. But, to the homophobes, two men or two women visibly display their immorality upfront.