Because the human mind is prepared to have up to 150 friends (the so-called "Dunbar Number") and most of us are not at 150, so we replace them with who we see on TV or in magazines.
Our capacity to grow and to assist each other depends very much upon our being "willing to communicate." (1 Timothy 6:18) Communication includes proper measures of counsel, correction, and commendation. Since we depend upon each other to supply these ingredients in our lives, our insensitivity in communicating can be far more damaging than we realize. When we "pass by" others and "notice them not," a degree of deprivation occurs. (Mormon 8:39.) One of the ways, therefore, we will be "proved herewith" is our determination as to whether or not we love others enough to give and to receive such vital communications. We may quickly say that communicating thusly with those close to us is difficult; indeed, it is, but with whom else is it really possible? Are not the people proximate to us our tiny portion of humanity, given to us by God as our social stewardship? We can scarcely attain that attribute of sainthood—being "full of love" (Mosiah 3:19)—unless we are willing to communicate by giving and receiving appropriate counsel, correction, and commendation.
Yes, one of the great challenges of life is for us not to give justifiable offense, nor to be offended. This can be more easily avoided if our brotherhood and sisterhood are real—and if we are willing to communicate, including the difficult giving and receiving of counsel, correction, and commendation. Helping relationships always involve some weighty communications. The true Christian is a communicator.
It is so easy to pass by, especially when we are busy and when we are on the equivalent of the other side of the street. We are busy being busy. We are often actually less generous with our time than with our money. We keep forgetting where our time comes from!