The person who seemed cold on day one might’ve been terrified. Day two is a free retake. Give it.

Coldness and fear are almost impossible to tell apart from a distance. A nervous person goes flat and short, you read it as dislike, you act a little cooler yourself, and within a day the whole thing has set. A first meeting carries far less information than it feels like it does.

Think of somebody you wrote off after one bad introduction and try again with a plain hello this week. Assume nerves instead of dislike and see whether the room changes. One more attempt costs you almost nothing.