You're forgetting the fact that he's twice your age. And if you don't want someone to consider your boobs, maybe you shouldn't draw so much attention to them with the low cut tops and, I dunno, blatantly talking about them?
Being aware that he's taken doesn't make your comment any less skanky. You said it yourself, you have no shame in being inappropriate. Acknowledging that you are, in fact, being inappropriate, and admitting that, no, you really don't give a shit. So take your offended little attitude somewhere else when all I'm doing is calling you out on what you're admitting about yourself in your own comments.