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The original was posted on /r/AmItheAsshole by /u/taAitaniecedoor on 2023-09-23 23:59:18.

I (M) was invited to spend last weekend with my brother and his family (wife and niece - 6 years).

It's the first time I visit him after he got married because I used to live in another country and now I live in a city relatively closer. As it wasn't possible to do back and forth, he invited me to sleep at his house on Saturday. His guest room is a suite. The stay was great, the wife is kind and my niece is adorable.

On Sunday, I went to take a shower and left my clothes on the bed, taking only my underwear. When I left, I was in my underwear (boxer) and going to get dressed. At the same time, without even knocking on the door, my niece came in to talk to me, the door was open and as soon as she saw me, she apologized and closed the door.

I just thought it was funny, but soon after, my brother came in angry saying that I should my bedroom door if I'm going to take a shower, because my niece wasn't obligated to see me like that.

I agreed and added "It's not my fault that she decided to open without knocking, I didn't expect that someone would open the door without giving me time to let me knoknow."

I didn't speak in a mocking tone, but just being sincere.

He didn't like it saying that this was creepy behavior especially if I'm in someone's house with children.

Well, the tense atmosphere didn't last long, because I was already leaving, but I'm really lost in this and to make it clear, the bathroom door was closed.

AITA?