Attacking someone's sexual preferences is considered petty.
John has just met Bill and as they are talking with each other Bill mentions that he is gay.
John wants to respond to Bills declaration of his sexuality.
John tells Bill that he appreciates that Bill is brave enough to tell him such a thing and tells Bill that who he loves is his business.
John tells Bill that being gay is blasphemous and that his choice to be with men is something he should keep quiet about.
Bill is happy that John is supportive and non judgmental about his homosexuality and feels safe around John.
Bill is shocked that he is being judged so harshly and is stunned that John is so backwards and hateful.