If I had the privilege of being invited over to Leo's house, I most certainly wouldn't take any pics inside the house. Even if I had no intent on posting them online. 1 he's obviously private and it's plain rude/creepy and 2 I wouldn't want to jeopardize ever being invited over again. But it all depends how close you are to him, people like Lukas, Vinny etc can take whatever pics without it looking weird but the people close to him probably don't care about taking pics of his personal photos/ random possessions in his house.
Anyways, in regards to this situation, the weirdest part is obviously the fact that they posted it online.