> A larger number of accusations of racism might indicate a problem, but there is no way to get there from just the data available on yelp.

Is it sample size you're concerned with or do you have some sort of existential problem with relying on the veracity of these sorts of reviews?

I don't actually know how many negative reviews of this sort it would take to keep me out of a place. I'm not a habitual yelp user (and I'm white, although I would happily boycott a place where this sort of thing takes place) and so I've never had to consider this. It wouldn't take more than one such report from a real-life acquaintance, however.