Definitely did not mean to offend or seem arrogant.
I have served with Corpsmen in my prior unit that have been extremely motivated, intelligent, some of whom had college degrees. One was an activated reservist HM1 who was an ICU nurse in his civilian life. I have also served with Corpsmen who have been (or seemed) extremely disinterested in their job and not motivated to learn. I do not make the assumption that all Corpsmen are the latter; 95% of my Corpsmen have been examples of the former. Again, Corpsman33, did not mean to offend.
I do not have much experience with Corpsmen in the hospital. At my old command, it was my firm belief that the Corpsman with whom I served be experts at TCCC and have a good grasp of common sick call complaints, and how to do proper musculoskeletal exams. Like 61November, I tried to focus my teaching on what I thought they had to know if they were alone in the field or some OP, away from the BAS for an extended time, and without the luxury of all the equipment/supplies/meds in the AMALs.
In the hospital setting, again, I would keep your teaching focused, concise, and relevant to where they are working. Any teaching you give is something valuable, especially to the junior Corpsmen.