With doctors and nurses as well as patients (or parents of the patients) who understand the medical terminology you are using
Saying something nice about them. Now you may ask “why” ? .. the reason is kindness is limited to a certain degree, hence, you can KILL someone by being kind and maybe even positively impact the person into being kind themselves :)
Behaviors that could lead to unhealthy relationships are being too clingy or demanding. the more arguments you get in sometimes, the more toxic the relationship could become.