She lost me when she said: obviously you are not a doctor. I arrived in a vets office and I said: my cat is checking all the symptoms for diabetes and I would like to run some labs on him, the vet laughed and said “you are not a doctor”. Turns out my cat had indeed diabetes. He putted him on vetinsulin while I told him cats usually take long lasting insulin. Changed vet, she insisted on vetinsulin for months till she finally agreed with me. Currently, people are more educated and have instantaneous access to information, be careful underestimating people, they might not have the general knowledge you have, but they might have done their homework.