Nah... in time "plus sized" will just become the new "fat"  When ever they try and come up with a PC term it will just be used as an insult after a time. This is also something people with mental retardation don't get at all. "Idiot", "imbecile", "moron", "cretin", "retard" - these have all been the medically correct or PC terms at some point but they take on negative connotations so why bother changing it. Use it as an insult and they'll have to come up with some other word to protect their fragile, yet obese, feelings.