>nor are we/they gonna be the ones to approach dudes on the
>street & start lecturing OTHER men on the desultory effects of
>THEM catcalling

you don't need to lecture to communicate disapproval, an eye-roll or a tilt of the head can do the job if done right. most men who are being harassment think it's generally accepted, so it's important to say it's not.

a couple of times in my life, men have told other men to "leave the girl alone" when my own grim indifference wasn't effective enough.