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Yes, I know what you mean. Unfortunately, there are teachers who grasp a subject thoroughly but are unable to help students understand the concepts of that subject. It seems that math teachers are among the worst for this.
Teaching is art and science, and teachers need to be cognizant of the fact that childrens’s minds approach learning in a variety of ways. The truly successful teacher learns how to spot these diverging paths and use them to his advantage.
My girl brain has never been comfortable with spatial and dimensional challenges, and, while I have greatly improved regarding math over my many years, I am best staying with my strengths, the language arts.
In our house, if it involves numbers my husband is the one I consult. He calls on me for spelling and grammar.
I think that sometimes we forget, we all have our strengths and weaknesses, our interests, and the material that bores us or confounds us. Physics was always interesting to me, whereas chemistry was just not easy to comprehend. Likewise, I was Ok with math, but history (especially European history, which was a staple at my college for some reason) was a very, very difficult subject for me.
Rote memorization was always my weak point, whereas time/space and the dimensional stuff was my interest. Probably has something to do with my field of employment (which is loads different from my college degree).