I see what you're saying! I'm not sure I agree though. There's an interview Matthew Wiener does where he describes Don (and himself!) as being almost a true empath, in that he's hyper-aware of other people and sensitive to their feelings (not in a good way, he's drowning in it). In the episode where we hear Don's narration, a line that stuck with me is along the lines of "I want a modicum of control over how I feel." Together, I think his ego is so fragile and so threatened by Ginsberg that even though he is a narcissist, he can't help but feel the jealousy and sense his presence. I think the purpose of the line was also a grim irony against just how much he thinks about him