"I can do bad things because the opposite happens everywhere else all the time"

I feel this often comes up when you confront someone.
Some friends of friends were discussing an artist coming to town, one girls shows her phone to the other and the conversation went like this:

- "Oh yes him I know he makes good songs"

- "Yes, and nice muscles especially hahah"

Girl 1 sees me frowning a bit and goes "you have two types of girls". I respond I think it's interesting how today we would never accept me talking about a girls body to another guy like that.

Then she responds "yes but there's already so much disgusting men doing that I think it's fine"

I just let it go at that point because I know where this is going and it's just different or whatever. But I feel ultimately no one is ever going to look at their own behaviour because there's always the cop out that somehow out there the world is against women so they can behave to the same standard as the worst of the locker room talk.