No black guys have followed us (at least not those I've been doing field research with) in vans yet, though the others said this white guy said hi to us while we were walking down the shady, tree-lined University Avenue because he thought I was a girl (the umbrella probably didn't help).
Apparently the Latina at the Shell earlier also thought I was a girl, after which I was advised to tie up my hair so black guys wouldn't assault us because they were jealous of my hair.