It is different if you are in a shop or on a bus, train, etc., where you have no ongoing relationship with the employees or other shoppers/service users. But if you are at work you have colleagues with whom you interact on a daily basis, and I think it is insensitive, if not rude, to speak with one or more other people in a language that you know other colleagues don't understand.
Have any of you got all electric cars? Pros and cons please.
Angela Rayner lashes out and calls Sunak “pint sized loser”.