Guests are allowed to do anything. Otherwise the host is not that great.
Thats ridiculous. So if a guest wants to place his drink on top of an expensive speaker possibly marring the nice finish and also lowering its resale value, I should just suck it up and not ameliorate the situation because “the guest is always right?”
Sorry, no. I think you are looking at this from only one side. I wouldn’t want to incaringiy ruin anything my host owns when I’m invited somewhere. And I don’t teach my kids “you can do whatever the hell you want at someone’s house because your the guest.” Do you?