Ascetic is the opposite of hedonistic. It means scorning worldly desires and pleasures, and self-denial. It's sometimes thought to create spiritual discipline, or sometimes just someone's tendency.
The spiritual discipline version is on the same order of magnitude of absurdity as theism.
One common cause of ascetic qualities is arrogance. Another is anti-capitalism. TV is for the masses of capitalist drones, to keep them mindless. Products are a trap for lesser people, and I shall avoid them. Toys are for low brow kids; mine will enjoy nature and possibly some books and be free. Look at all those Joe Schmoes wasting the money they slaved away for at McDonald's for a few minutes of pleasure, they won't fool me. blah blah blah
Joy is a great thing.
I suppose there is an important distinction that needs to be made now: some ascetics don't value joy, others simply have trouble creating much.
Feh, this isn't going well. Write comments with questions, I'll just make this really simple.... To those who don't value joy: you're silly. To those who have trouble finding joy: I sympathise.