I think that too sometimes. Some laypeople and students tend to want to diagnose and classify everyone around them (oftentimes with the wrong labels and because they don't understand or like the person) and some trained professionals also like to pigeonhole people without attempting to really get to know them or understand them as well (many "mental health" professionals don't belong in the profession at all). Sometimes personality disorder labels = societal persecution and rejection vs someone getting the help they need especially those labelled as having cluster B traits.

Yup, and calling people mentally ill for wanting to climb in life. "You were born a slave, you will live as a slave, and die a slave. Now get back to work."

Maybe but good thing this isn't always the case. For example, see Carl Roger's work.