
I have dealt with the obesity prejudices personally, and have gone from
morbidly obese to normal to
obese, the last because of pain issues, not caused by the weight, as my back was in decent shape when I was at my lowest weight for several years.
Weight can cause problems, or add to them, but it is not the answer to everything that goes wrong with a person. If he just sees your weight, he won't look for any other underlying conditions that might be causing a "weak" spine.