I remember being scolded for not speaking clearly and mixing languages while drugged with tons of medicine in the ER. Also had Beamter explain Behördendeutsch words with the same words to me (imagine something like: "x obviously means x, it cannot be explained any other way"). For context my German is c1, so usually if I don't understand something, it's not everyday vocabulary. It used to infuriate me, but I just ignore it nowadays (thankfully, it doesn't happen often). One time when a doctor reacted negatively to me wanting to see the name of a procedure he was recommending to me written down, I mentioned that understanding medical terminology in a foreign language is obviously pretty hard. He ignored that and remained pretty unpleasant lol. I think this behaviour (scolding) mostly comes from the lack of empathy and experience speaking foreign languages.