8-bit has 256 choices. 32-bit color has 4,292,967,296 choices ranging, in binary, from 00000000000000000000000000000000 to 11111111111111111111111111111111. People aren't like that. There is more to the world than black and white. There are shades in between.
Most people understand that much.
What some people don't understand is that it applies to a lot more than just skin color. Sexuality isn't binary. There are heterosexuals, homosexuals, and bisexuals, but they're all blended into each other into different levels of them. Some people are only attracted to men, some are only attracted to women, and some are attracted to both at varying degrees. It's not binary.