I edited my comment, not sure if you saw the revisions, but you may want to look over it again.

While I agree on the surface - I have to ask... no matter what?

Any rules must be applied to all people, and be applicable to all people unless for some very specific reason.

"I through you out if you yell and scream" is fine. "I throw you out if you walk into this place wearing symbols of hatred" is fine as well. "I throw you out because of who you are" is not.

Being gay isn't a decision people make, it's not a choice a person has in their life. Heck, there is even argument that the same is true for belief, that we are set up over years to believe what we do, and we can't just change that on a dime. To not serve someone, especially in a nation where so many may share your views, can hurt them in a severe way, can isolate them from society, drive them to desperation, make them feel hated. That's why all people have the right to be treated well, and why Christians do not have the right not to serve gay people. It hurts them, it hurts society, just as much as any other crime.

At the end, laws, rights, and rules are a question of "what's best for us". Religious practice is a right because we all deserve to believe without being told we cannot. However, when that right infringes on the rights of another, when that right hurts someone else, it should not be given.