i agree with this, but throughout this country wealth is typically stratified by race, so it's not too far fetched to say that the behavior that T/S is referring to is pretty typical of your affluent white person. And you're more likely to receive this type of treatment from a white person because there are far more affluent whites than affluent minorities.
Now I will add this: I can say that I have received this treatment from more whites than minorities but my experiences differed greatly depending on what facility I worked in. When I worked in an inner city trauma center, I got treated like a chambermaid by people of all races. I found that people's frustration and loss of control over their unfortunate condition caused them to seek control over the one group of people they can control: nurses. They would run me ragged and complain about every little thing. And most of these people were far from affluent. They were minorities just like me, and they would routinely make comments about how much they hated the facility and how much the care sucked despite the fact that they/their loved one didn't have a smidgen of insurance and should be grateful that they are receiving tax funded healthcare. Inmates would do this as well: they were so used to the restrictions of prison, so when they had someone to take care of them, they abused it.
now when I changed jobs and started working in a heart/lung transplant unit full of affluent whites with iron-clad insurance policies and end stage heart failure, I experienced the type of treatment T/S is referring to.