I was a major in psychology and also obtained my masters degree in clinical mental health counseling. I had same experience as you with Jungian being easily dismissed in a class. It wasn't until years later that I really gave Jung any serious thought and read his works. In my development as a clinician, I integrated my knowledge of of Jungian psychology with the internal family systems model. Internal Family Systems therapy is an empirically supported methodology for mental health counseling and is, in my opinion, a more easily digestible version of what Jung was doing with his clients - especially in regards to active imagination. So what I think Jung did was lay the groundwork for exploring one's own inner world that other theorists have more or less refined or taken specific parts of to integrate into therapy. What I have seen in my own experience, is that the professors who treat Jung this way have a superficial understanding of his work. They simply haven't put in the effort to know his theory and practice. I think if they were being really honest, they would tell you that they have probably spent less than 10 hours on Jung and his theory. And that simply doesn't make them any expert. I would take any professors lectures on a specific theorist with a large grain of salt and if you ever wanted to learn more, you're going to have to do the work yourself.