Loving or even just civil discussion of an issue never includes ad hominem (against the person) attacks. Those are the cheap shots, low blows, and diversions from the discourse.  Fr. Martin and anyone who cherishes respectful dialogue realize that further discussion is fruitless as they are dealing with a blocked mind, not one open to learning.
Perhaps the catechism needs to be rewritten.  For centuries the topic of sexuality has not been handled well by the Church.  Hopefully only due to a lack of knowledge and understanding.  However, closed minds are never loving minds.  We are called to love our fellow man.  That can never be done without personal respect first.