The most important thing about everyone would be their "personal space" because we carry it everywhere. Another word would be vibes, energy and this can be very attractive or a repellent. Our personal space is like a magnetic field that surrounds us and when you pay attention you can recognize the energy and learn to respect that. The outermost energy or aura presented comes from our thoughts and third eye. Everyone is responsible for the energy and vibes carried out and is a huge influence to the bonds that are formed with people. A big misunderstanding or what people often make a problem is getting mad when they are unable to connect or keep a connection going another person.
The reality is that not everyone is going to get along and when a lasting impression has managed to be made between two auras that means they both were on the same wavelength. When people have vibes that don't mesh than their personal space will not be penetrated. Recently, I went to a Washington Wizards versus New York Knicks home game and I was in the Acela Club level by the bar. Evidently, I was not on the same wavelength as the lady sitting next to me because she told me to move over which shows that we had differences in energy levels and I respected her request. Being able to pick up on people's magnetic field can tell you a lot about them.
To keep the peace and love people for who they are it is important to respect their personal space. Even for those who live in the same household or consider each other family should respect one another's personal space. From day to day the vibes that we give off can vary in strength from how are body is doing and our higher self caused from feelings. It is quite and art to know if you can get close to someone and if it is even feasible. What it all comes down to is how you approach someone. When a stranger comes up to you or vice versa, it's not the end of the world that no bonds were formed. The best thing is to let go and let live. Kind of cliche but there are different strokes for different folks, and that's the true beauty of life.