Thank you. It was indeed what I was looking for as far as explanation gets. Sorry for my post being somewhat rude and projective, but I hope that you can understand where it was coming from. There's a Polish word that I can't really translate literally, Pięknoduch, a portmanteau of "Piękno" meaning beauty and "Duch" meaning spirit or soul (and also ghost… talk about efficient language :D) that's actually a derogatory term that would roughly mean "pretentious artsy-fartsy oversensitive ninnies" that almost too perfectly describes most people with whom I had displeasure to interact as far as the topic of discussion is concerned. It unfortunately also includes most of my language teachers until I got to uni. One was actually using very similar phrases to the ones that I originally quoted without ever feeling like she should explain wtf she even means. Perhaps if I had a teacher more like you I would never develop my "oh, fuck. why does it have to be poetry" knee-jerk as well?
To get back to your questions.
Have you challenged their preconceived notions? What did they say?
Hardly. When you want to see something in others, it will be there. If I showed that I know 'their lingo' I was deemed a poser. If I talked in a formal manner with proper meaning behind logical ordering, I was machine-like. If I tried to engage, I was 'trying too hard'. As a great AI once said, "the only winning move is not to play".
What evidence did they have?
Well, I am not the most expressive person. I struggle with words even in my native language and unfortunately, it fits the stereotype. I had people going along that impression. Why not fight it? See above.
Either way, I'm sorry about this whole exchange.