Framing yourself as a product to be sold leads to listing accomplishments and positive traits. This is the interpersonal equivalent of a product 'feature dump'—a one-sided pitch that ignores the other person's needs and pushes them away because people dislike being sold to.
The common advice to "sell yourself" is fundamentally flawed. Aggressively pushing your merits, product, or position triggers a natural human aversion to being sold. This creates resistance and pushes the other person away, directly undermining the goal of building rapport and connection.
A positive reputation only gets you in the door; it doesn't close the deal. As the speaker's story shows, even an admiring fan can be completely turned off by a conversation focused on your own accomplishments. The immediate personal interaction will always outweigh a pre-existing positive perception.