I was a language major and took many language courses (Foreign and English courses) throughout high school and college. Those professors were by and large the strictest and most exacting (along with my linguistics professor). I don't know if it's that the subject attracts/requires the personality or that the subject demands that level of adherence and ultimately impacts their way of teaching, but that was my experience. Ultimately I appreciated it, though not initially.
It's not unheard of that language teachers take their students on trips abroad to expose them to food, culture, etc of the country the language they are learning is used.
I have a friend who is French, teaches french, and has phd in linguistics. She is not above introducing her students to French cuisine, in fact ordered some french macarons from me to hand them out to her students for halloween. she said her students have never heard of them and wanted to remedy that. She teaches college level.