I remember after my first big fitness push when i started lifting and put on some muscle mass, going to lunch with some coworkers (normal dadbod guys) and I got this really large helping of curly fries from the girl at the counter. I'm gay so I didn't think anything of it but a coworker commented "she must really like you." That's when I realized that people really do treat you differently when you're fit vs fat, even if they won't admit it. Most people probably aren't even aware that they do it, but they do.