The Imperial medical droids are extremely polite, while the Republic med droids are curt to the point of rudeness. Given that the Republic is supposed to represent Good, and the Empire Evil, why are the Republic med droids rude?
Maybe the Imperial droids have to be programmed to be polite. Maybe they once had impolite droids and the Sith kept cutting them into bits for being disrespectful.
It's like how C2-N2 can get away with being so smug and condescending, yet 2V-R8 constantly begs you to not deactivate him. You know a Jedi probably
isn't going to twist your head off and throw it out the airlock for getting on his nerves.