Some wise folks once told me that whenever you add a "but" to a sentence, you're negating what you've just said. "I don't mean to be nosy, but...." (then you ask a personal question), "I don't mean to be mean, but..." (and you go on to insult someone's taste or appearance), or "I'm not trying to micro-manage, but..." (and you take over what clearly is someone else's responsibility). Ah, that favorite word, "but".
As I read an article this morning about Bubba Watson by Jeff Rude (his column is called "Hate to Be Rude") I could feel the word "but" coming. He didn't actually use it (he used "yet", which to me meant the same thing), but the point seemed the same.