I've never been to a doctor, skilled or unskilled, who's treated me like a piece of dirt. I've never witnessed a doctor treat a patient like dirt, nor have I ever. Likewise, I've never seen a plumber, hairdresser, acupuncturist, cashier, nurse, waiter, teacher, or random person on the street treat someone like a "piece of dirt". The only two types of people whom I have seen do this are cops and landlords (and insurance administrators, but c'mon they don't qualify as people in my book😛). Saying that someone treats another like a "piece of dirt" is really impugning their character and should be avoided unless it is objectively true.
People tend to be too sensitive to perceived slights against them. Patients, because they are sick, even more so. Even small affronts against them, the kind we all experience everyday, can become major issues. This is a problem and demands a capable bed-side manner in physicians. Not all physicians have such great interpersonal skills (just as is true for the vast majority of the general population), but this does not mean that they go around treating patients like dirt to be trampled.