Loose leaf teas are much harder to steep, and if you steep them wrong, you end up with a rancid bitter flavor (for lots of higher quality teas).

To quote a song: "You could not feel sadness if you've never tasted joy" - perhaps, if he's content with his tea bags, we can let him drink his tea bags. Since switching, I can tell you first hand, that I can no longer drink tea bags, or even poorly steeped teas without cringing. I sound like an asshole, I know.