It was NYDailyNews.com
They've since removed the pic and posted this....
CORRECTION
An earlier version story contained an error that said that a pro-Zimmerman protester held a sign saying, "We're racist & proud" and shouted that slogan at pro-Trayvon Martin protesters. The woman displayed the sign in front of the pro-Zimmerman group, in an apparent attempt to mock them. It is unclear whether the woman, identified by the Houston Chronicle as Renee Vaughan, was involved with either group.
Looks like NYDailyNews needs to read this thread :)
She was not attempting to "mock them." She was pretending to be one of them.