I think fat/overweight/obese people deserve just as much as anyone else - human rights, to be treated with respect, seek happiness, etc.
But I don’t think they’re healthy; while not everyone who is a ‘normal’ BMI is healthy, I think being overweight precludes any idea of being healthy.
I’ve been in a few fat positive groups over the years, and they were full of people getting angry at being embarrassed that they don’t fit in airplane seats or rollercoaster rides, and getting angry at doctors who suggested if they lost weight their back/knee pain might improve. Both sets of people are utterly ridiculous in my mind. The health ones especially - the doctor is giving you solid health advice, advice which has a solid clinical base, but you don’t want to do it because you’re proud to be fat?! What are you actually expecting them to say or do then?
I say all this as someone who was morbidly obese - I too used to brush off how much my weight was affecting my health. Then I lost ten stone and so much pain has gone, and my blood pressure is down into a perfectly healthy range.