There's nothing wrong with it, just as there's nothing wrong with wolf whistling or a bit of harmless cat calling. It can and does raise a smile for both parties it's just part of the ridiculous "me too" movements agenda.
It's just a bit of cat-calling, it's harmless.
It's just a bit of banter, it's harmless.
Its just a friendly pat on the bottom, it's harmless.
It's just a cheeky grope, it's harmless.
It's just a rape, it harmle - .... oh, wait. It's not harmless.
Cat-calling, banter, policing emotions ("smile, love!") are the base on which misogyny is built and you don't get to decide which bits of it are harmless. Allowing everyday sexism is allowing continued intrusion into the rights of women, it undermines our equality, and it gives the greenlight to those men who want to take it further than "a bit of banter" by creating a culture where women are lesser.