When you burn one friend, everyone who watched quietly updates their settings on you.

Every audience is also a jury. When people watch you treat a friend badly, they are not only judging that friendship, they are quietly working out what you would do in their position. Nobody announces this, which is why the consequence arrives later and unexplained. Reputation is largely built from moments you thought were private between two people.

Handle your fallings-out as though the people nearby are paying attention, because they are. Disagree without dismantling anyone in public. If you have already burned someone, repair it where it happened.