I would have no problem giving the disc to the person. It's a way of celebrating the moment.
Having said that.....
What if the shoe were on the other foot? Say your friend wants you to try out one of their new/favorite discs and you end up acing it, would you take it?
I would answer No. If it was me, it was probably a fluke anyway. I would never throw the disc that well again so I would leave it in their possession. That way every time they used it, and not scored an ace, they would subconsciously think about my great throw and feel inferior. (evil laughter)