It's not sexism if you don't go to a woman's baseball game. It is sexism if you don't want them to play.
It's not sexism if a woman tries out for a team and does not make it based on her performance. It is sexism if she is not given an opportunity to try out in the first place because of her gender. It is sexism when she meets the same criteria that men have met in order to pass the try out, but is rejected anyway due to some made-up reason, like children do before they learn about fairness and integrity.
It's not sexism if a man is not hired as a grade school teacher because someone more qualified is hired for the position. It is sexism if a man is not hired as a grade school teacher because someone is "uncomfortable" with a man being around young children.
It's not sexism if a woman tries out for a team and does not make it based on her performance. It is sexism if she is not given an opportunity to try out in the first place because of her gender. It is sexism when she meets the same criteria that men have met in order to pass the try out, but is rejected anyway due to some made-up reason, like children do before they learn about fairness and integrity.
It's not sexism if a man is not hired as a grade school teacher because someone more qualified is hired for the position. It is sexism if a man is not hired as a grade school teacher because someone is "uncomfortable" with a man being around young children.