Example Situation
My 8-year-old daughter played on a coed soccer team and was one of the stronger players. The boys kept telling her she 'runs like a girl' and wouldn't pass to her during practice, even when she was open.
What was happening
Her gender was used to dismiss her athletic ability — the assumption being that feminine means less competent, even when the evidence was right in front of them.
Outcome for child
She became quieter during practices and eventually asked to switch to an all-girls team. She said it was 'just easier.' She lost confidence she didn't need to lose.
Thoughts & feelings
I wish I had intervened more directly with the coach. I kept hoping it would work itself out. It didn't.