I think what he's saying is, if that stops you, you weren't going to get very far anyway.
It will obviously be easier to draw Marc's attention from a high socioeconomic stratum, but as a VC it's not in his interest to make it completely impossible for anyone. At least that's the way I read it.
"That is my test of whether this person is a true entrepreneur. If they are, they will find a way, by hook or crook, to get to someone who knows me"