What has blackballing got to do with night?
Because the dark has had negative connotations for millennia and for very good reasons which have nothing to do with race. Going back to Confucius and the Ancient Greeks and the bible. “God created light’. That’s when he created life.
These negative connotations where because even then they knew that without light, life couldn’t exist. In winter when it was dark, no food grew, it was cold, it was more dangerous, life was harder, very little work could be done and life was much harder. In the Summer, when there was light and warmth, crops grew, food was plentiful and people were healthier and warmer, work could be done.
Daytime was associated with work and respectable activities that people were seen doing. Night was a time for clandestine activities, robbery and the supernatural. There are all very practical reasons for those associations which have nothing to do with race.
Not to mention that at the time and places we know these ideas and phrases developed, very, very few people would even have been aware of people of different races, racial politics and cultural baggage didn’t exist, and there certainly wasn’t the awareness of race in a way which would have led to language developing in a way to express racial prejudice.
Angel food cake was developed first and was said to taste so good it was the food of the angels. Devil’s food cake was the same but with Cocoa added. As the opposite of Angel’s food cake, it would have been called that because Devils are the opposite of angels and people at the time would have been very aware of that and the story of the Angel Lucifer becoming a Devil as a fallen angel.
There is lots and lots of evidence about these religious and cultural connotations with night and day and the origins of these phrases happening because of the negative/positive associations with night and day and light/dark. And we also know those associations didn’t have racial connotations because they did not come about at a time when those viewing them would have been aware of or concerned about races.
White also has associations with purity and cleanliness (including moral) for entirely practical reasons. It shows the dirt. You cannot hide if you are dirty if you are wearing white or if your furniture is dirty when it’s white. So people wear it to demonstrate their purity, again nothing to do with race.
There is absolutely zero evidence that it has anything to do with race.
If you’re becoming offended by things by making up imaginary connections which have no basis in factual evidence I’m not surprised you are offended all the time. Because you could literally look at anything and make up your own narrative and decide that makes it racist.
I’m sure you could probably make up some sort of narrative about how Bourbons and Custard Creams were racist. After all, Bourbons were very nasty kings and Custards have no such negative connotations.