Earlier this week, the so-called graffiti artist Kidult splashed the word ART in pink letters across the front of Marc Jacobs store in Soho, following similar vandalism of Christian Louboutin, Hermès, Louis Vuitton, YSL, and Colette in Paris.

But trying to out-stunt Marc Jacobs is proving to be a losing battle for Kidult. Rather than naming a bag after the graffitist, Jacobs (or someone at the label) created a pink T-shirt with the words Art by Art Jacobs and a photo of the defaced storefront, accompanied by a tweet that read: “Available now for $689. Signed by the artist, $680.” That prompted this not-so-clever retort: “@MarcJacobsIntl … ??? LET’S PLAY, but we don’t play the same rules!” Then, a bit later: “SHAME on you, YOU COPY @therealkidult to make money with it, capitalist thieve.”

Probably not a good idea to provoke a provocateur.