Take, for example, an ad that calls itself an ad, makes fun of its own format, and attempts to lure its target market to laugh at and with it. It pre-emptively acknowledges its own failure to accomplish anything meaningful. No attack can be set against it, as it has already conquered itself. The ironic frame functions as a shield against criticism. The same goes for ironic living. Irony is the most self-defensive mode, as it allows a person to dodge responsibility for his or her choices, aesthetic and otherwise. To live ironically is to hide in public. It is flagrantly indirect, a form of subterfuge, which means etymologically to “secretly flee” (subter + fuge). Somehow, directness has become unbearable to us.
via How to Live Without Irony – NYTimes.com.