While it would definitely help, the truth is kids brains are a hormonal mess. No matter what and how well we teach 'em, there comes a 'breaking point' where the chemical imbalance will override any 'training'
While double standards absolutely suck and should be eliminated wherever possible I think it's totally fair to have rules like this for kids (at least for now)
Just because my 13 year old brain knew 'girls are people too doesnt mean my 13 year old hormones cared about that when saying 'I like this'
This is not something that can be fixed overnight or in a single generation. And it will never be fixed 100%.
I can pretty much guarantee that even in the remote villages where toplessness is a normal part of everyday life there are still the 'oddballs' who love boobs and sexualize them.