It would be if this was actually happening, which is never. Maybe there's like a handful of shitheads out there doing it, but this isn't a wide-spread problem.

http://onlinelibrary.wiley.com/doi/10.1111/obr.12266/full

"Finally, physicians may over-attribute symptoms and problems to obesity, and fail to refer the patient for diagnostic testing or to consider treatment options beyond advising the patient to lose weight. In one study involving medical students, virtual patients with shortness of breath were more likely to receive lifestyle change recommendations if they were obese (54% vs. 13%), and more likely to receive medication to manage symptoms if they were normal weight (23% vs. 5%)."

> Comparisons of recommendation categories for shortness of breath by condition revealed that students were more likely to recommend lifestyle changes when the patient was obese than when she was not obese, χ2 (1, N =76) =14.6, p<.0001. They were less likely to recommend symptom management (i.e., bronchodilator prescription) for shortness of breath when the patient was obese, χ2 (1, N =76) =4.8, p<.05. There was, however, no significant difference in recommendation rates for diagnostic tests.

The article links to research showing that it is a wide-spread problem. There may be valid criticism of that research, but your flat unsupported denial is not that criticism.