We as human have difficulty dealing with impertinence, but not being able to cope with it can create discomfort in our lives. We must learn that everything ends, and nothing stays the same. Accepting impertinence is the ability to accept change, and loss in our lives.
The human need to find permanence is an opportunity for suffering to arise. Humans fight change and loss. We do whatever we can to avoid it to protect ourselves, and keep us in a safe bubble. Doing this is quite paradoxical, because even though you may think you are protecting yourself. You are hurting yourself more, and creating more suffering by avoiding the inevitable.
Change and loss are reality. There is no avoiding it, but a mindfulness mindset can help you cope with it. The best thing you can do is accept it. Many people see it as having a negative mindset, but avoiding the reality creates a negative mindset. Accepting reality creates a positive mindset, because when the inevitable happens. You will be able to handle it better, and bounce back quicker. You may even be able to see the bright side in the situation.
This is all part of being mindful. Acceptance of difficult situations is key to our peace of mind and happiness. Permanence is not reality. Once you are aware, understand, and accept it. Peace of mind will follow.
Psychology of Mindfulness 