Lol this.... The thread should end here.
I worked for a liquor store in high school and used to deliver liquor/beer/wine/kegs/glassware/ice etc... Whatever the customer needed to hook up a party, it would get loaded into a van and delivered. I also would have no idea of the race of the customer until I saw them face to face at the party location. Blacks rarely ever tipped me despite also being capable of throwing some big drinking parties. Sometimes it would take over an hour to unload and set everything up. When you see a high school kid loading and carrying full kegs, sometimes up stairs with a hand truck, even going through the task of setting the keg on ice in a tub and tapping it and then don't tip, then you are just a cheap piece of shit.
We also got stiffed on tip at the end of the party, next day. All of the aforementioned items needed to be picked up as well at the end of the party, loaded in the van and returned to the store. The black customers quickly developed the reputation in the liquor store and none of the employees wanted to deliver to them. We never provided less than normal service to any customer, even when they repeatedly stiffed us. It has to be a cultural thing that most of them adhere to or most of them are just cheap asses.