Therapists work with pedophiles and I've never heard of a therapist wanting to "quit" the client because they don't agree with their lifestyle. And alcoholics and drug addicts, shoplifters, wife beaters, child abusers, former rapists and murderers. Never have I heard of people refusing to work with these kinds of people.
But gay people huh, for some reason someone who loves someone is a big big problem. Bigotry. Plain and simple.