you know what I think is stupid? when guys are like "oh well you're a girl so you can't do that" or something along those lines like why I or any other girl not throw a football? or join the army? be a king? or whatever else you wanna be? is there a legit rule in writing that says "girls cannot do this"? no. girls are just as good as boys. every girl including myself can do everything boys can do and be anything they wanna be. so the whole gender standard forget that it's stupid.
This is a great way to simply express that color preferences are not based on gender. Having simple sayings and posters like this around a school/classroom can spark opportunities for healthy conversation.