I really don't like this attitude. It's just smugness about medical knowledge, because it's often paired with a hate for people that come in for things that are easily googlable... Directing people HOW and WHEN to do research would be so much more productive for a working doctor-patient relationship.
It's about the patients who think they know more than the person who went to school for like an extra 8 years and did hundreds of residency hours, because the patient googled some shit for 45 minutes.
It's a pedantic point but most medical doctors don't have PhDs, they have what's known in some places as an "honorary" doctorate from their medical degree, hence the title "MD", for Medical Doctorate, rather than PhD.