I would have smiled at the bigot, and promptly informed them that I was a member of the Homophobia Should Be Outlawed movement, and how proud I was in the great strides we have made to corrupting children with thoughts of tolerance and acceptance, and today is a day to celebrate that those who cling to the old beliefs of hatred are slowly dying an embittered and frustrated death that they are powerless to stop.
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Then watch them walk away without comment.