My doctor has a fabulous line something like: "Huh. I haven't seen that before, but you seem to know your stuff and it sounds like thats legit for you." I don't know why more physicians can't do that, or why such a phrase isn't given to them in medical school!
To be a little bit fair to the physicians we complain about all the time, they don't live with D, and how else are they supposed to know but what the textbook says? There have to be some generalities- food makes BG rise, insulin brings it down- or they could never even start to treat us! For certain some take it too far, but imagine you had 600 patients who each "knew" that their version defied logic but were absolutely certain thats how it worked for them. While I don't discount that some are extremely confident and using data-based facts (like with a CGM that runs true the first 24hrs as verified repeatedly with a glucometer over months of use), but I have met MANY D-peeps (both 1s and 2s) who are "sure" of something that doesn't hold under pressure- everyone from the old stubborn uninterested T2 who is "sure" apples make BG go down because she "can feel it"; to the equally stubborn 12yo T1 who "does better math than the Bolus Wizard" and refuses to use it instead opting for fuzzy math in his head for lunch every day and then complaining about running from 50 to 350 on a regular basis and how "brittle" he must be.
I do very much think many doctors have poor 'bedside manner', and sometimes a little empathy or just a "Really? I've never seen that, tell me why you think thats the case" would go a lot further than their arguing with us, but do keep in mind that probably 75% of the patients they see are generally unmotivated, uninterested, and maybe not intentionally making things up, but are more interested in saying random things that support their story than in using data to actually prove it.