Impolite to poop

So I went to see a movie at my aunts house and went to the bathroom to take a #2 ... a few minutes later mom comes knocking on the door I was like wth... to make a long story short when we were going home mom asked me what I was doing I said taking a #2... mom said that I is rude and impolite to poop in a house that is not yours ... I was like ...what is it there for then...... so u tell me is it impolite to poop