to judge a book by its cover
to make decision about people based on what they look like
to make up your mind (about others)
to make a decision (about others)
instantly click with (new acquaintances)
to have a positive connection or friendly rapport with one, often quickly
to come across as (boisterous or calm)
to behave in a way that makes people believe that you have a particular characteristic
to talk down to (people)
to speak to someone in a simple way, as if the person cannot understand things as well as you can
to boast
to talk with excessive pride and self-satisfaction about one's achievements, possessions, or abilities
to get to know
to begin to know someone
to show off (oneself)
to behave in a way that is intended to attract attention or admiration, and that other people often find annoying
to warm up to (you)
to slowly begin to like someone or something
to get on really well
to have a friendly relationship
to break the ice
to make a start by overcoming initial difficulties