These classes I was referring to were often taught by a native speaker, so there was always at least one person in any class worth emulating. But that was never really my issue so I am not a good judge of how others experience that problem.

Moving backward a few years, my high school teacher (singular) was a bit odd. He sat us in the same alphabetical pattern every year. Behind me sat a girl with impeccable vocabulary but some of the worst pronunciation in the whole class. Meanwhile I had impeccable pronunciation and a respectable vocabulary.

By senior year she had still not improved, and some days it was more than I could take. It was only a few years ago that I realized that while she couldn’t see me make faces, the teacher could. And so he had to stand up front interacting with her while I was in his field of vision, trying and failing not to make pained facial expressions. I don’t know if he found that frustrating, amusing, or something else.