I too, as faking stated, am in the prespective of being the student. Im the rookie in my squad (lol 30 something rookie no less) and have had a few teachers along the way.
I had the gruff teacher, jumped all over me at every turn if it didnt do it "their" way. Made me feel less of an EMT, like I wasnt good enough. Especially if it was done around a patient or their family memebers.
I had a laid back teacher. Kind of a go with the flow man teacher. Well Im just glad I didnt kill anyone.
I had a teacher that let me go about the call the way I wanted but lent a hand if needed. This is and was my best teacher. To this day I learn from this person. When we run calls together I have confidence in myself and it shows. My moves are deliberate, consice, nothing wasted. I have a confident, not arrogant, tone with my questions. My hands feel more, my ears hear more. It is because as I was learning I got to teach myself but with the reassurance that if it was going downhill I had a partner that would step in and help. I had slip ups but wasnt talked about until after the call. That I liked, I wasnt embarresed. I was able to realize what went wrong and why without a spotlight on me.
One thing I will say, I dont know if it goes for everyone, dont call your rookie a rookie, newbie, greenhorn, fresh emt, what-have-you during a call. I had some teachers that would let everyone know I was new and it hurt actually. It made folks turn away from me and talk to my partner instead. That never helped. If you talk on scene talk like the two of you have worked years together. I used to tell folks after my feathers got ruffled enough...
It says EMT on both our sleeves noone knows rank or experience.
Basically all anyone sees is that we are both the same as far as they know, why let them think anything else. Its their emergency the last thing that want is someone, they feel, cant do the job. Even though this rookie may be the best in the business if you call him out on the job (scene) the preception is he cant do anything other than be a go-for.
Good luck in your teaching and hopefully you can get through to him. If not, use it as your learning experience and move on to the next. Some folks just dont mesh well with one another.