Apologies to belMarduk for the unintentional offence.

Of course in Quebec or any bilingual area both languages will be used. But that is exceptional as far as most English-speakers go. And of course a board dedicated to language is also an exception, where it is understood the others are likely to have a wide knowledge of language.

But for most English speakers, use of any foreign language is excluding. Most of them don't have the education that bilinguality affords, and no longer get the classical education that allows them to pick up Latin tags. I stick by my contention that, in most contexts, significant use of any foreign language is not at all the done thing. (Of course I, skilled in language, find this frustrating, not being able to use my knowledge.)