Keep doing what you are doing. Don't let comments like this bring you down. All people say stupid things at one point or another. Remember, our nursing Prof./instucters are just there to guide us. They will not be holding our hand throughout school and you may never even see them again once you work as a nurse.
I had a situation happen a couple of times my first semester (final is Fri). I would here a fellow student talk about how our Prof. was building her up and not to worry about her F's(very nice girl btw and I really hope she passes the final). It kind of bothered me b/c I felt like where was my pat on the back for pulling A's??? I finally got recognized, eventually, which did feel really good . I think b/c nursing is pretty tough, and it should be, the encoragement is for those who struggle but have some hope, reallyneed that positive reinforcement so they don't drop out prematurely.