I say in another comment that humans like to eat meat because meat is a very good food for humans. What we like and don't like to eat depends on our biology and is tuned to drive us to find the food we need to survive, and thrive. So I don't believe you can decouple enjoyment _of food_ from the needs of a biological body- and so you can't sensibly speak of "purely for enjoyment".
On the side, this biological drive to feed is of course tuned for a different era, before technological civilisation and it leads to excesses today, e.g. the over-consumption of sugar, and the over-consumption of meat, particularly in _some_ parts of the world (e.g. the Americas and Western Europe). I certainly agree with the adage "eat food, mostly plants, not too much". But "mostly plants" means "also some meat". A little meat, we do need to eat for a balanced diet and a healthy life.
In any case, the desire to kill an animal to show off one's hunting prowess is rather on a different level to biological needs. Nobody _needs_ to kill an animal for sport in order to stay alive. Everybody needs to eat. That is the ocean of difference I refer to in my comment.
I'm not convinced that if more people grew up hunting, they would accept recreational hunting more- I think the opposite would be the case. I believe that people in the developed world, today, are so far removed from the reality of raising and killing an animal to take its meat, that they have lost all sense of perspective on the matter. I believe that this distance from the act of killing has caused people to adopt extreme views, like veganism (though not necessarily vegeterianism, more broadly), or a complete indifference to the fate of animals. If more people had direct experience of hunting -or farming- and slaughtering animals, I believe we would see many fewer embracing these extreme views.
I don't think it's possible to decouple morality from the opinions of a specific culture. Morality is not a universal. For example, some human societies practiced cannibalism, even advanced societies like the Aztecs. There is a book that I love, "The true history of the conquest of new Spain", written by one of Hernan Cortez' conquistadores, Bernal Díaz del Castillo [1]. In the book, he describes the horror of the Spanish at the everyday cannibalism of human sacrifices by Aztecs and also the self-mutilating cult of the Aztecs' priests. People in different historical times have found very different things acceptable or unacceptable. We can't really hope to find "a bright moral line, without reference to a specific society's opinion" for anything from within the perspective of having been born and raised in a particular socieity, in a particular point in space and time.
Personally, I think that valuing all life as sacred is what comes closest to a true moral universal. This might surprise you, but my point is that valuing life means accepting the fact that life on Earth is made to consume other life to preserve itself. In order to survive, every living thing on the planet must eat some other living thing. Well, except for plants that do us all a big favour of underpinning the great food chain with their ability to feed directly on the rays of the sun. Everything else- we must eat each other; and plants. In any case, I believe also that valuing life above all else means that we should only take what we need. This means eliminating excesses like industrial food production and mass consumption, for instance, and certainly it means reducing the suffering of the animals we kill for food to what is absolutely unavoidable.
Hunting for sport is absolutely avoidable and I don't think it comes close to killing for food.
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[1] https://en.wikipedia.org/wiki/Bernal_D%C3%ADaz_del_Castillo