Actually, it is more along the lines that they would have nothing in common except the probability of a shared interest in music and entertainment (the usual ice-breakers among strangers), a possibility of similar housing locations, and a clear need on the part of the new person to know what the corporate/departmental attitudes toward blacks might be.
And, as has been shown by the wide range of responses, above, simply the appearance that someone is more similar to oneself in some way seems to be sufficient to trigger that sort of behavior in all humans.