Obviously nobody should be deliberately cruel or nasty. Do no harm is not the same as "be kind". Everyone should do all they can to avoid harming others of course.
However I am increasingly concerned that quite vulnerable people are being told that they have to be kind first and foremost, and that this is often detrimental to one or both parties.
Sometimes, often in fact, children, girls, women and indeed vulnerable men need to put on their own oxygen masks first. Sometimes they may put themselves at risk or incur an unacceptable cost (not necessarily financial) by believing that they are a bad person if not seen by others as always, always kind.
Sometimes being kind is misguided and does harm, and sometimes it opens the vulnerable person up to exploitation (not necessarily criminal nor even calculated exploitation, though this is sometimes a risk, but exploitation of their good intentions) and sometimes kindness isn't what the other person needs.
AIBU to think the bland "be kind" admonishment is often completely inappropriate, and we should think more critically before telling vulnerable people including children that it's the rule they must live by always and in every situation?