My sister was shopping in a ritzy area populated mostly by well to do Caucasians that day, so the woman could have been from that area. My sister used to be on several boards and committees, including the County Freeholders and mentioned Caucasians who shouldn't have been able to, were able to somehow get food stamps because different criteria was used for them. A friend of mine worked for county welfare and had told me something similar about how it was easier for some folks to get public assistance than others.
Your reference to the Benz reminds me of another story. Same friend who worked for welfare had worked two jobs for much of the time I knew here. She decided to buy her youngest son a nice car, a BMW I think. She said "every time he turns the corner the cops stop him". It's the old...well if he's Black and driving a nice car, he must be a criminal. She was very disgusted by that, as was I. That being said, your assessment in the last sentence is probably accurate, at least in some cases.