"The going idea is that texting has, in essence, made graffiti a universal pastime: Barely punctuated, sparsely capitalized and with decidedly creative spellings throughout, texting means that today's America is reveling in writing badly."

This is an extremely poor and essentially meaningless comparison between graffiti and texting. People spell properly in spray paint on walls all the time. A defining characteristic of graffiti is its engagement with public spaces; I see no real connection between graffiti itself and the words the author used to describe it. To make a better comparison, this description could actually be applied to poetry rather than graffiti.