I think that it is great that you want to try something new. I will someday also try to use traditional equipment, but that day is not here.

My personal opinion...If he don't want to support your decision, it is time to find a buddy that will. A true friend, hunting partner, whatever it is you would like to call him would support your personal growth of any kind. Personally, my hunting buddy wouldn't care at all. More than likely he would find his own bow so we could have at it together and see who can master it first. But that is just how we are...always got to one up the other

Now if you decided to only use a gun only to hunt, than that would be a different story all togther.