(I'm assuming) you are not a professional and this isn't a professional opinion. Me calling someone "dumb", maybe offensive, probably impolite, but as I'm not

(I'm assuming) you are not a professional and this isn't a professional opinion. Me calling someone "dumb", maybe offensive, probably impolite, but as I'm not qualified to asses intelligence, carries little weight. A professional whose job is to asses mental capacity calling someone "dumb": just as offensive, but also unethical.