DR, good job. Clearly we're all proud to walk with you about this.
Your story, the way that you interacted with the teacher (with or without a supervisor, and I think the way you did it was fine, given the circumstances) is yet another example of why I have argued for years about the importance of clear, concise, complete articulation of ideas, using correct grammar, punctuation, logic & critical thinking.
I don't know where you gained your mastery of such, but - as a college-level educator who stressed such skills as much at the topics I was teaching (biology & math) - I commend you.
THR rocks. I'm so glad to be part of this forum.
Nem