Is it inappropriate for boys to walk around the house shirtless? For girls is it inappropriate to walk around in just your underwear?

Like I live in a house with a big family and my older brother feels it’s inappropriate to be walk around shirtless as a boy. He too used to walk around the house shirtless when he was younger but somehow his views on walking around the house shirtless now, as a boy is inappropriate and for the girls to wear short shorts or like no bottoms persay. I get it but I also don’t get it. It’s my home. Can I not feel comfortable enough to do that? You only live once as well. He feels strong that until we get our own place then we can do whatever we please but as we live with other people it’s highly inappropriate. Fair point but I just don’t get it. I find it a little weird that it’s viewed inappropriate
Is it inappropriate for boys to walk around the house shirtless? For girls is it inappropriate to walk around in just your underwear?
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