"Groups with guitars are on the way out, Mr. Epstein"
Dick Rowe, A & R man
"It is only when men contemplate the greatness of God that they can come to realize their own inadequacy." Jean Calvin
Refusing to serve 2 gay people who came in to the restaurant, sat down and ordered a pizza, is discriminating against gay people. Refusing to cater a gay wedding is refusing to take part in a ceremony that violates the religious tenets of most Christians, Muslims and Jews. It is the event that they refuse to take part in, not the serving of gay people.
Of course you know this, just like everyone knows this, whether they admit it or not.
The reality is, this is an assault against people of faith by the anti-religious bigots on the political left. They want to force them to either renounce their faith, violate their faith, or be financially destroyed if they refuse to comply. They are demonstrating exactly what hate, bigotry and intolerance looks like.