Random points:
1) This is 2022. Where exactly would it be considered acceptable professional practice for a physician to address a patient as 'sweetie'? Now I get that some of his regular patients may know he's going to do so and like it, for Dr. Strange to do this to an unknown patient, or even an existing patient whose preference for such terms of address he does not actually know, well...?
2) About 12 years ago I recall teaching a class at the Christian school I worked at, where I told the students, juniors and seniors, wrt appropriate college practices, 'never ever address a female professor as 'Ms., 'Mrs.', or 'Miss', unless specifically instructed *by her* to do so'. Did I do something wrong?
3) Following up on the point I was making (implying) to those kids, is that in situations of social intercourse where the people are (especially strangers), but in any case of different social rank in the situation (such as middle aged patients vs. 20-ish receptionists), the onus is on the social inferior in said situation to use appropriately respectful terms until and unless told not to keep on doing so.
4) I confess that I am a fan of 'Miss Manners'. She made the point explicitly, something which is SOP in traditional middle (and higher) class culture here in New England, but maybe less so elsewhere in the country, is that the inferior must wait for permission to change from using titles to address a superior, to using their first name, must never ask for such permission, and must not take offense if permission is never forthcoming.