Your comment made me realize that maybe we're just going through the transition to a collectively better understanding of people. Right now we sort of have to pass through the clinical diagnosis/therapy terms in order to recognize something as not being a moral failure/making someone less valuable as a person. And then the next step we're building to is maybe like acceptance of people's differences without needing to make reference to diagnostic labels. Kind of like what's happened with queerness: past - fluid, undefined, marginalized; present - labels, understanding, less marginalization; future - moving beyond the need for labels in order for people to accept and understand.
If someone is overly aggressive, or rarely fulfills promises, or is very negative about things, or has a very fragile ego — it absolutely makes them less valuable as a person to others. Just look up any definitions of the word “valuable”
