When I went, we had an American on his own in our tour group, he would not stop asking inane questions unrelated to Auschwitz. Went from Kraków which is a decent 1-2 hour minibus journey and he spent the entirety of it speaking to the person in charge about bloody lunch! was lunch included, the times of lunch, how long it lasts etc the guides broken English coupled with his strong accent lead to him just repeating the same stuff over and over as they both struggled to understand one another. We thought it would stop when we got there, nope, whilst they’re getting you all geared up with the headsets and running you through the rules etc he was still asking other people about lunch. As revenge I lead the entire minibus in quizzing him for 90 minutes on his lunch and plans for tea when we got back
Also, the amount of people trying to take photos in the rooms that explicitly say no photography was ridiculous.