I'm thankfully pretty shielded from this most of the time, since I'm self-employed and work from home. I imagine if you work in an office or on-site, then the comments would happen. I had my first a week or so ago, when visiting a friend and she quietly said I looked skinny and asked if I was well. She hasn't seen me in a while, so I guess there is a noticeable weight drop and I KNOW my collar bones and neck sinews stick out prominently now. It still triggered a weird body dysmorphic patch in me, and thankfully my partner put my mind at ease. In her defense, she was coming from a place of care, and she has suffered from restrictive eating disorders in the past so I know she was just seeing my jutting bones and making unconscious connections to her own past.
My real test will be Xmas and going interstate to see the family and in-laws for the first time in about half a year. I am a good size and a half smaller since they last saw me.
All that said, anyone calling out to a stranger OR an acquaintance with the word "fat" needs a kick between the legs. Inexcusably rude, fundamentally unfunny.