I legitimately had a huge argument with my (former) roommate over primary colors.
She was more artsy, I was insistent that the primary colors were RGB, she was insistent that they were RYB. We googled. We were both right in some senses.
Hilariously enough, my fiance now works in printing and actually mixes the colors (t-shirt printing).
I haven't brought it up yet because we once had a fight over whether that thing you put outside your shower is called a bath mat or a bath rug (Both are correct in different circumstances)
She was more artsy, I was insistent that the primary colors were RGB, she was insistent that they were RYB. We googled. We were both right in some senses.