How many black people did it take to change a lightbulb?
Only 1 because it's just a lightbulb, but note the past pretense 'did'. We took lightbulbs away from black people to stop them from culturally appropriating from white people and all the hard work being done by people like Thomas Edison.
It's impossible to culturally appropriate from white people, because that would be punching up, rather than punching down.
Amirite, Cream? 
Well the power imbalance makes it not appropriation when specifically referring to Black and white Americans. I can’t really think of anything white people have done or made that black people have taking the credit for and Profited from while whites don’t.
Saying inventions like “lightbulb” “computer” just reveals someone doesn’t understand what cultural appropriation means.
Sure, I'll bite. Levantine, Assyrian, and Mediterranean caucasoid people are the closest genetic progeny of Ancient Egyptian civilization. Black people constantly try to appropriate their history. Check out how many black people think Cleopatra was a black woman and not a Greek one.
Same goes for Moorish Berber influence in Europe that is constantly construed as "black" influence. Although, I don't understand why anyone would want to take credit and pride in the Moorish invasion and centuries long raping and pillaging of Southern Europe, but I guess imperialism is okay when the right people do it to the wrong ones.