I think that in a lot of cases you will find that especially if physical privacy is not able to be maintained (small room that needs to be shared). There will be additional space (respect) that will be created for mental privacy.

In the past or in communities today where physical privacy is not always possible you will find there are a lot more accepted ways for people to separate themselves. Third spaces where you can be uninfluenced by the other party will be more common, going out for dinner alone or to the park alone are examples of activities that will be more normalized in those communities.

Your parents could probably be out the whole day without being tracked or recorded fully. However the modern day surveillance (including tracking of kids) means you will be tracked everywhere. You don't have the luxury anymore of going somewhere anonymous.

Ask your parents what they did when their sibling annoyed them.