A bit extrem for an exemple, but Rape is textbook objectifying (among other things). You only care about the body you want to have sex with, with complete disregard to the person's desire.
When someone ask you to stop using pejorative name because they dressed (or undressed) too provocatively and you answer that if they didn't want to get dirty name, they shouldn't have dressed like that is also objectification: you are only there to enjoy the body, and disregard the will of the person.
there is a lot of people who don't understand what is wrong with saying "if you don't want to be called a slut, then don't dress like one". The gist of it, is simply, you don't insult people you barely know and haven't done anything wrong to you, no matter what, it's basic standards. When someone ask you to stop insulting them, the natural thing to do is to stop, not to think that there is some sort of special clause that allow someone to use dirty langage if they aren't allowed. there is no such clause.