Someone posted a status saying "To the girls who have their boobs hanging out in every picture: You may have a ton of guys who like your photos, but how many of them do you think actually respect you?" and I don't know how or if I should reply...

I would personally say: 

Dear Judgmental Prick, 

If those guys aren’t sexist judgmental jerks they would respect me for who I am regardless of what I wear. 

Love, 

A girl who has her boobs hanging out in some pictures. 

That’s a little confrontational of course, but that’s the type of person I am. 

Honestly though, most of the time it’s not even worth it to say anything. I just unfriend people who post shit like that.