Sounds like someone just watched Unbreakable for the first time.
Super heroes are red and blue, super villains are green and purple.
So:
Hero: https://upload.wikimedia.org/wikipedia/en/3/35/Supermanflying.png
Villain:
https://superheroeseveryday.files.wordpress.com/2021/11/149-luthor-new-costume.jpg
Hero:
https://upload.wikimedia.org/wikipedia/en/2/21/Web_of_Spider-Man_Vol_1_129-1.png
So I know what you're thinking... "What about Hulk? Green skin, purple pants, why is he a hero?"
https://superbromovies.com/2018/05/02/the-hulk-and-the-incredible-colors-of-a-villain/
"Simple: he wasn’t originally the hero. In the early issues of the character, the Hulk was more of a villain, destroying everything in his path and Dr. Bruce Banner was the hero of the story."