"Excuse me, who are you?"
Translation:Извините, кто вы?
November 10, 2015
You definitely should report this as an error next time you get this sentence.
Yes, this works in some cases:
- if you are in an informal group of people where everyone is considered a peer (e.g. a group of students in the university; this might be acceptable at some parties, in some websites, at some workplaces — this is very individual, though!),
- if you are talking to a child,
- if you wants to deliberately insult someone and show your disrespect.