Same thing here - on top he was talking in English (I'm German) and didn't even ask if I was in a good position to talk. Talk about awkwardness to my colleagues.
At another job I worked at, our team had some of the most well-known devs in the metropolitan area, and our office line received 5-10 calls a day from recruiters asking for one of the devs. We had a team rule: you answer with "Hello" only and don't give any information to the caller until they give you their name, company, and reason for calling. It didn't stop some people from calling us daily.