Another data point related, from another white dude that has had many experiences.
Color may indeed be a factor in some situations, however I have found that, to be an issue, that is heavily dependent on location, time of day, and when combined with other factors such as clothing, tattoos, and many other signals.
You or I might or not get asked for proof of fbook employment with color being a factor in that, sure - however I do believe that other factors would weigh on that choice even more. Compare two made up people - one with a pocket protector, a patagonia vest, some khakis, dress shoes.. another has sagging jeans, tattoos, a snoop dogg tshirt (or willie nelson for that matter), whatever... with attributes like those, I would bet that the other factors would have more to do with the choice to verify than just color.
This is not to say that there are not bad cops in the world who only go by things that they should not - and I certainly strongly believe we need more different training, and checkups with our law enforcers in this country (and the world) 100% -
I can say that many other factors are at play when most cops try to summarize things - time of day and location, along with other signifiers are something that usually play more of a role in decisions.
These things are not always good indicators of good guy / bad guy - its just something that plays out to be helpful in more situations than not.
I also do not agree with the 'everywhere in the US' statement - things are very different in my neck of the woods when you drive only 30 minutes - and they change immensely when you drive another 30. One could experience all kinds of different treatment based on things like color, type of car, type of clothing, choice in music, ways of speaking, all sorts of things, and that treatment could change every 30 minutes all day long, and you wouldn't even cover but a small percentage of this country.