Culture and economic class certainly play a role in all fields.

Given that there are several minority fellowship programs hosted by the major therapist-member organizations, I would imagine that they are trying to diversify the field.

I go to a clinic that has about 20 therapists. All but two are white. The other two speak spanish.

So if you were a black person and wanted to speak to a black therapist, you could not go to my clinic.

As far as whether that is a problem, that is in the eye of the beholder. I wouldn't blame anyone for wanting to talk to a therapist who grew up in the same culture or community.