The actor said that he sat down 22-year-old Rumer, Scout, 19, and Tallulah Belle, 16, when they were younger and showed them how to beat the bullies.
The 55-year-old told Britain's Daybreak, 'I taught them a little thing when they were younger and they can actually protect themselves now.
'Walk up to any young guy who is shoving you around in the playground and scream in their face, 'It's not okay to be mean'. It works too. 'It's not okay to be mean'.
'Try it, it works. What you have to do is get right up to their face and scream at the top of your lungs, 'Hey! It's not okay to be mean!''