If a woman slaps you, they are just admitting you are not equals. She knows most men won't hit back, because they are so much stronger than women. In their mind, they are below men. We need to slap women back to bridge the equality gap 😎.
Depends on situation. Likely and hopefully nothing. Can't really win. I wouldn't blame someone slapping back though, but I usually try to thing the power/strenght difference.