It shouldn't have been hard for this photographer to get them to buzz off.
"I'm sorry, but I don't do photos of gay weddings. Here are the phone numbers of a few who do. If you insist on hiring me, then I don't know if you'll be happy with my work because I don't do this sort of thing. Therefore, I'm going to ask you to sign this document which clearly says that due to my lack of experience with that kind of event, there is a very high probability that my pictures will not be acceptable to you, and you therefore waive all right to sue me to get your money back."
"No? You are going to hire someone else? OK, bye"
<ptp> how many emo kids does it take to change a lightbulb?
<Willy> HOW MANY?!
<ptp> none they just sit in the dark and cry