你们有没有英语菜单？should be accepted. Reported

Why is 你们有英文的菜单吗 rejected?

Why does the Duolingo course insist on using "you guys" for "你們"? I wouldn't say that in a restaurant, it's so informal that it would actually be a bit rude. Just use the plural which is "you". It's as if Duolingo doesn't want to accept that the singular and plural are the same in English.