I'm a 29 year old male. Sometimes find myself in a situation with a male coworker who I've just met, or a male stranger who I'm talking with (at a bus stop, for example), and they make a comment about a woman that I find to be in bad taste.
For example: "Have you met the new secretary? She has an amazing body doesn't she?"
Or a stranger in public: "Check out that girl ... I'd like to get some of that!"
My goal is to simultaneously communicate these two things:
I feel that their comment is demeaning and objectifying of women
I'm not trying to put them down, and I don't think I'm morally 'above' them. I don't think less of them as a person and I haven't become less interested in having discussion/friendship with them.
Clarification: I'm not suggesting that it's disrespectful for a man to simply find a woman attractive. What I find demeaning and objectifying is when a man verbalizes his sexual attraction to a woman's body as a topic of casual conversation - especially when the man clearly has no knowledge or interest in any character trait of the woman. Also demeaning and objectifying are comments made about sexual things he would like to do with her.
Update: At least one answer to this question notes that I didn't mention anything about wanting to change the way the person thinks. But that is really my greatest hope in the way that I respond - that I would help the person to think more critically about the way they talk (and think) about women; that their perceptions of women would not be reduced to sexual preferences and fantasies.