I think people's issue with what you are saying is the fact that you are making a blanket statement disparaging all defenders as not as athletic or that they don't have the stick skills to play midfield and other slights....
My daughter plays defense because she enjoys it. She was selected for SG Team 1, for UA Underclass, etc. She can go to camps and play midfield which she does as well.
Your tone and blanket statements make you sound like a [ChillLaxin] which is why you are getting such blow back.
It's not what you are saying is necessarily incorrect. College coaches do move middies to defense in college. But the great HS and Club defenders are just as highly recruited as the best at any other positions. This is because if coaches can find girls with the same athleticism and stick skills that are already well versed in defensive positioning, communication, clearing, sliding, etc that is quite a valuable piece on your team.
Stop insulting young girls and maybe people won't react in such ways to what you are saying. | 
