Saw it happen once on our lease. We had a female member who had never killed a whitetail, and to top it off, we were bowhunting. In fact, she was pretty much a new hunter with just a couple of seasons under her belt. But she's a go-getter and worked hard at it...harder than most. She ended up getting a beautiful P&Y buck of over 140 gross with a perfect shot. I was surprised that even some members of her own (married-into) family could not really be happy for her. There were back-stabbing discussions that she "cheated" in getting to sit that stand that evening (we used to draw cards for stand picks), etc, etc.
Personally, I was absolutely thrilled for her and let everyone know it. She EARNED that buck the hard way. I could not understand how others, especially "family and friends" could not be anything but happy for her.
Net, I think Claude hit the nail on the head. Has nothing to do with hunting, per se...it's a nature some people have. As a manager in a large corporation, every time I would give an award, many others would bitch that the receiver was not worthy.
I just ignore them and keep moving on.