I was an athletically built teenager with killer legs and wore, at most, a size 12. My ribcage has been 38 inches around since I was 13 years old. It's just a fact, I will never wear a smaller bra 'band' size. All that to say that I was nowhere near even overweight on the BMI chart. I was very fit. I biked for miles and miles daily. I was in band from 5th grade on. Hero worshiped the band director. He was a man among men. I played the instrument they needed, not what I wanted to originally. blah blah blah. my senior year, i decided to try out for (and made) the new color guard for marching season. Halfway through band camp, I was pulled into his office and told to lose weight - I was absolutely mortified. I was by no means the largest girl and had actually spend the summer when I wasn't marching / rehearsing cleaning pools and swimming. I was in the best shape of my life. I was scarred for years. So deeply that I didn't even tell my mother until after the man died over 20 years later.
I've had more fat shaming and dismissals by medical providers than I could begin to enumerate. Most recently, I was diagnosed with severe osteroarthritis in my right knee, due to multiple injuries (i've torn the ACL 3 times and sprained it multiple times over the last 25 years). The level of severity could have been lessened had any of the orthopedists I went to in 2006 after the birth of my first kid, or in 2008 after a slip and fall sprain type injury, or in 2010 after unexplained pain bothered to do simple x-rays and pay attention. Instead, I was told "lose weight" and we will re-evaluate. Dismissed because I was not worthy of time or treatment, but please be sure to charge my insurance and collect a co-pay.
Just yesterday, a post-appendectomy surgery appointment was another instance. Even though I've lost the equivalent of an adult man, and I am now directly in the middle of "normal adult female body size", my concerns over a seroma and large hematoma at the incision site were summarily dismissed, as it was located within the pannus left after last year's hernia repair without panniculectomy. Even not SMO now, my body appearance is off-putting to skinny bitches and they dismiss my concerns because of it.