MTZehvor on 27 October 2016
It seems to me that you're not arguing that "fun" is more objective than "cool," but that what people view as fun changes far less frequently than what people view as cool. You mention that fun has a long lasting appeal, while what is cool and trendy now may not be so in the future. This seems less like an argument that fun is more rooted in objectivity than what is cool, and more that people's view of fun is far more consistent than what society views as cool.
