I harbor no disdain. However, regardless of one's perspective on the issue (MD or DO or whatever), stitching MD on a DO's coat is simply not representing the truth, regardless of intent, hence the "whack."
I don't buy the whole "people don't know what a DO is" thing to justify this. It seems to only perpetuate the current uninformed state amongst certain patient populations by mislabeling the physician (who for some reason needs to be labeled with an embroidered jacket as opposed to a brightly color-coded ID tag that screams PHYSICIAN). But if the fancy sewing is a must, keep the DO stitched on the jacket and let the patient find out what's up. That said, very few patients could give a hoot... at least where I'm from where most people are very aware that DOs exist and practice modern medicine.
All-in-all it's not really THAT big of a deal, but it's still sort of beat. I'd rather see the truth, personally speaking.