When someone remembers how you take your coffee, they’ve been paying attention. Notice who does.

Small details are stored only by people who were actually present. Nobody tries to memorize how you take a drink; it gets kept because they were listening when you said it, which is a regard that does not announce itself. The detail is trivial and the attention behind it is not.

Keep track of who does this for you, because that list is usually more accurate than your list of close friends. Then start collecting on purpose: one fact about one person this week, and use it next time. Remembering is a skill, not a personality trait, and it is learnable.