The effect of selection

A: Not caring about the music tends to make for poor dancers and has knock on effects: poor male dancers tend to be those who prey on women by walking up to invite them, putting them on the spot and making women feel rude if they don’t accept.

B: It is useful to recognise that's the effect of selection.

In a Buenos Aires milonga, poor male dancers aren't dancers. They are men sitting hoping to dance.

In a UK milonga, the only way a poor male dancer gets to dance is by demanding.... and being accepted.