Some PCPs may lack people skills, but most are trying to impress upon their obese patients the importance of losing weight (diseases, shortened life expectancy, mental health, etc.) based upon their first hand knowledge and experience.
A PCP should not say "You fat (bleep), why don't you put the fork down some time and go for a walk!" -That would be cruel, unprofessional and unsupportive.
They could say "According to the weight/height charts, you should try to grow 4 feet taller".
My PCP encouraged me to lose weight in a positive way by suggesting dieting, offering advice on losing weight and over time, eventually entertaining the thought of bariatric surgery.
She is a consummate doctor, has great people skills, is very caring and THANKFULLY, has a small index finger (guys know what I mean).