"Hate" is a very strong word, something like "It's funny how the rainbow has... because in art class today" would seem more appropriate but clearly you feel very strongly about how the Gay community have used this symbol to represent freedom.
By the way, if you think that that art exercise "belonged in kindergarten" you weren't paying attention. It's one of many such exercises designed to get you to think differently*. By putting them in rainbow order you failed to understand the question, so it might have been better to pretend it was a deliberate mistake to make a political point and so look like you were an avant-garde genius LOL.
* Also try; painting a kitchen utensil using only a kitchen utensil, drawing a still life with one single unbroken line, or painting with household bleach on black paper.