This is more of a promotion to increase and solidify their white clientele then to actually show appreciation to the poor, underrepresented white people.
In all honesty if I was going to a Mexican restaurant and saw nothing but white people, I would leave because I would know it wasn't authentic. That's my litmus test for ethnic restaurants. I do the same for Chinese, Japanese, Ethiopian, Vietnamese, Afghani, etc restaurants. If the majority clientele is not of the ethnicity of the restaurant then they aren't authentic and most likely serve crap.
But the restaurant is called RubbinButtz BBQ...