Have you been to a German university? Plenty of technical subjects will be taught in English even if the speaker and audience are German.

There surely us a kind of arrogance that demands Germans speak English, but I don't see anyone in this thread expressing that.

(I won't even begin to talk about the variety of dialects and identities contained within the modern German state, except to say that there is plenty of arrogance to be found there for those who seek it.)

Yeah, but they do it to attract foreign students. Otherwise everything would be in German with english technical terms, where appropriate.

I don't think that's true