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Stop saying that native English speakers NEVER say this or that! You, or people from your locale, may never —or, most likely, rarely— say, "a coffee,” or whatever the phrase is, but others may say it quite frequently.
…And for Americans, you are NOT the only English speakers, so it does not matter if, “We don't say that in America.” This is an International app. It matters little what is not said in America, (or England, or Australia, or Jamaica, or India). As long as someone says it, it is good. You do not dictate English for the entire world.
I agree, except I think that this course in particular is intended to be based on American English.
However, I think that, whenever possible, Duolingo should still try to use example sentences that are more universally accepted by most English speakers (both inside and outside the U.S.) in order to minimize confusion.
For example, in this case, Duolingo could use "Café con azúcar"/"Coffee with sugar", which is probably accepted by everyone, including all the people who accept "A coffee with sugar".