Good point! So when we 'vent' to friends/family they may assume we're looking for advice, when really we just want to vent - period. So, when they give us the feedback and it's not what we want to hear, we're disappointed or frustrated!
Perhaps the lesson is to set an expectation with f/f before we vent that it's just that; or maybe don't air it out with them and vent to our C's or this board, etc. instead.