Should you be told when someone in the family you're visiting is showering?

i visited a friend recently and when i got there i had to use the bathroom... the door was open a few inches but didn't hear any water running and it was day time so i couldnt tell if lights were on so i walked in and saw her brother naked getting out of shower... i was so suprised and froze for what seem like a few minutes

Should you be told when someone in the family you're visiting is showering?
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