What does John Bennett mean with "All those rich black people can't be wrong"?

Here's the full context:

WAITER: Here is your dessert and champagne.

LORI: Ooh, Cristal.

JOHN: It’s a special night. We’ve been dating for four years. And hey, all those rich black people can’t be wrong, right?

Champagne in general, and Cristal in particular, has long been perceived as a popular drink among hip-hop artists, whether for recereational use or as a symbol of wealth in various rap lyrics. You can read more about this in this article as well as this one from BBC News. Here's a clip from the latter:

Rappers love it, quaff it, idolise it. But the makers of Cristal champagne have revealed they are at best ambivalent about the patronage of the hip-hop fraternity. [...] it is the drink of people whose taste in luxury items stretches only to things that are big and shiny, with big, shiny badges on them. Rappers like Gucci, they like Prada, they drive Bentleys and Benzes and most of all they sup Cristal.