Why would Conan say "doesn't" instead of "didn't"? Is it because he believes that Emily Post would never say it even if she's still alive?
Native speaker’s answer
Rebecca
That could be! It also could be a mistake on his part. Since he speaks in front of a live audience, it is easy to make grammatical mistakes without noticing. Most native speakers don't worry about small grammatical mistakes like that when speaking. You will hear a lot of mistakes like these from talk show hosts. You will even hear it in movies and songs! However, these mistakes are intentional to fit a character or fit with the artist's vision of the song.