So why aren't Pando Daily and Valleywag celebrating this instance of the oppressed striking back at the evil white gentrifiers?

As noted in Salon:

 Part of being honest about street harassment and creating awareness of it has to be an honest assessment of the ways this kind of harassment can be a way marginalized groups talk back to the white gentrifiers taking over their neighborhoods.

So there ya go.  Evil white gentrifiers lead to sexual harassment of random women on the street.