Try asking him what he didnt like about golf. You might get an interesting answer. It could be something as easy to fix just by giving him a shorter course to play,,ie a par 3 course. Another idea might be to let him bring a friend next time. That might solve two problems, by him seeing that his friend doesnt hit it all that far either, and just having a friend along might make it more fun along the way.
My grandkids that are that age, get as much fun driving the cart ,,not always possible on most courses. Hunting for balls is also something they enjoy. They also tend to get frustrated when they mishit or whiff, especially off the fairway,,so let them use a tee in the fairway. And make sure to compliment at every opportunity. Also bring a snack, and plenty of juice,,they tend to get hungry and thirsty.
With my kids, I found that getting them truly interested in golf didnt happen until around age 10. By then their motor skills had improved along with general strength to the point they could actually get some distance. I found enrolling them in golf clinics was also helpful, being around other kids their age, tended to bring out their competitive spirit, plus hanging around with their friends seemed to help as well.