Your response will certainly hold water with those who cannot accept - or comprehend - the all too important spiritual aspects of celibacy: solitary dedication of purpose to God's service, and sacrifice of the flesh to benefit the soul.....and thus his service to other souls.
Regardless of the cited exceptions to mandatory celeibary stated above (which are a very tiny minority of priests), celibacy remains a very important companant to the priesthood. It is much more then a mere "discipline": it is the basis of the "wedding" of the priest to Christ's church.
I agree totally, celibacy is a gift. It's interesting to see the eyes glaze over when you speak of the spiritual aspects of celibacy. Hit them in the purse and they have new appreciation for celibacy. Sad but very effective.