Yep, it's worrying that this old chestnut is often trotted out, I think almost without thinking, to brush off sexual bullying with a pot answer.
My worry though is that from a young age, girls begin to absorb the message that teasing, bullying and intimidation from boys is a sign of affection - that they should be flattered by the attention even. It's not surprising that many young women (well and women of any age,) feel ill-equipped to set clear personal boundaries in relationships and have developed a high level of tolerance of controlling behaviour which frankly, they've been conditioned to believe is "normal" or even "good."
Just stumbled across this really excellent video made by a young woman in America. It's more teenagers than playground, but it does show just how porous the line between acceptable and unacceptable behaviour can be, until you look at it full on. The Line