'I'm not obligated to accept unknown guests': Relatives protest when 25-year-old proposes changing door code after he asks them to petsit and they allow friends to stay

In this story, a man faced opposition from his relatives after they took advantage of having access to his door code to allow their friends and acquaintances to stay at his apartment while he was away. He had let them know the code so that they could pet sit, and didn't find out that he had guests until he returned from a trip and found unknown people in his home.
After this happened twice, he thought it would be a good idea to change the code. However, his family wasn't happy about this and accused him of being stingy. He wanted to know if he was in the wrong.
via Brock Wegner (Unsplash+)

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Would I be wrong for changing the door code after relatives kept letting extra people crash at my place while I was out of town?

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Commenters confirmed that he wasn't the one with a problem.

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