Let’s start at the end: During curtain calls at American Ballet Theatre’s “La Bayadère” Friday night at the Dorothy Chandler Pavilion, ballerina Isabella Boylston gave her bouquet to her partner Jeffrey Cirio with a deferential flourish. Then, in a strange, gender-bending moment, she and third lead Misty Copeland curtsied, and curtsied some more to Cirio, ...