I have noticed a similar reaction with a different twist. I have noticed since shaving my head and growing my beard that I frequently get beard complements from black ladies. It is almost guaranteed anytime I am out in public, if I have any interaction with a black lady I will get a compliment on the beard or mustache. From guys, its mainly the young guys who are trying to grow a beard or from other bearded guys, equally from any race. I can count on one hand the compliments from white ladies.As far as manors, I am in the deep south of the US and good manors are common. I have observed no differences in that.