Gretchen Rubin at The Happiness Project has "7 Tips for Minding My Own Business." An excerpt:
It's a Secret of Adulthood: Just because something makes me happy doesn’t mean that it will make someone else happy, and vice versa. I often fight the impulse to be a happiness bully, but what works for me might not work for someone else. I remind myself of the negative example of Thoreau: I almost can’t bear to read Thoreau's Walden, because he's so disdainful of other people’s tastes and values. When he writes about his own experience and views, I find his work very compelling, but he’s very judgmental and dismissive of any different vision of a happy life.