When I was in high school red and blue bandanas were banned because of the links to bloods and crips. I grew up in an isolated agricultural town in Florida, completely on the opposite side of the country where those gangs were. (are? I feel like they could have spread a bit since then)
...and thanks to that gangs are no longer a thing! Perhaps we should ban all colors! Conservatives would jump for joy as it aligns with their beliefs that all issues are black and white!