You’re right, people are abysmally rude towards fat people, I was obese at age 11 and continued that way getting steadily bigger till last year when it all came to a head and I was diagnosed with T2 diabetes and prescribed Mounjaro.
firstly the people at work should not be commented on your weight and doing so is bullying and harassment, raise a grievance with HR and address that because the behaviour is truly unacceptable in the workplace.
secondly, what tests have your doctors run to assess your current health? Is the assumption that weight gain is due to your medication based on actual test results or just it being a common side effect?
if possible try to get a ‘health MOT’ done. HbA1C to test your blood glucose over the last few months, cholesterol, liver and kidney function, thyroid function, vitamin D and iron levels. All of these could show issues that would cause weight gain and making losing weight harder.
I think Mounjaro is a miracle and feel so lucky that insulin and metformin didn’t work for me because it meant I was prescribed it on the NHS. I’ve lost a total of 9and a half stone now, am comfortably in the healthy BMI range, weigh less now at 42 than I did when I was 11, diabetes is fully controlled, cholesterol is back in normal range, blood pressure is normal and I can jog and do exercise without feeling like I’m dying.
You do still need to put in the work on WLIs, drink plenty of water, stick to a calorie deficit, carefully plan your diet to get more protein, fat and fibre and have complex carbs in small portions and white/simple carbs once in a blue moon. I can count on one hand how many slices of cake I’ve had in the last year and it’s been months since I last had chocolate. I track everything I eat and drink in my fitness pal and make a concerted effort to get at least 3 decent workouts in a week.