I Know You Are But What Am I?

Person: It is possible. Or wo would like it on the back of the ears?
telex22: Suffice to say that such a dumb question could only come from you
Person: That’s me. You can only illicit a conversation like this when I talk to a knockhead.
telex22: that’s you —
Person: Look how dumb you are. Like to see one? look at the mirror.
telex22: I can already see.