we assume about others then ourselves so much… we assume context, we assume motivations, intentions, personalities, potential / limitations, perspectives, experience, beliefs, importance of a thing or another, self esteem, taste or interest in a thing or another… sometimes due to impressions of a particular moment or impressions in contexts that were probably not obvious.
PS. Consider assumptions as biasses, and yes we have them about ourselves too.
Some pondering on that here: https://www.linkedin.com/feed/update/urn:li:lyndaCourse:3931647