Sports and sexes

I will blog about guys and girls in sports and the stereotypes of sports with different sexes; Such as, football. Why do people assume girls do not like football and have no interest in playing. I understand some girls may not like football but we are just as capable as playing football as the boys, even tackle. On our high school team there was one girl that ever played football, I am not sure if that was because everyone else is scared to try out or scared to do something different.
Another example is color guard in the marching band. Our high school band director would not let any guys try out to do color guard. They could be just as skilled and talented as the girls, he was a sexist guy who thinks If a guy is doing color guard and not playing and instrument he will not represent the high school band very well.