To be honest I don't think being flippant is a very bad thing. Even in public. It's somewhat bad, but not enough to make me care.
I am tired of P.C. and corporate-speak and all that shit. I've been hearing it all my life and all it's really used for is trying to obscure the facts and slip in subtle advertisements rather then transmitting honest information. It's confusing, irritating, and usually somewhat dishonest. That is what I call a 'bad thing'.
Between this kernel announcement and the horseshit, misleading information, and out and out lies that I see continuously on anti-virus websites and all sorts of other security-related software and corporate announcements/pronouncements/press releases... I'll take a flippant kernel announcement every time.