We all hear it, we've all been through it, we deal with it, we move onward, it's an unpleasant and necessary part of life I guess and an inevitable part of the arts. Several times I've found models on sites like Model Mayhem who I felt would make an amazing contribution to my work, only to have them look at my images with complete indifference, you can't please everyone. It happens to models just as often, they find a photographer who's work is exactly what they've dreamed of doing, only to have the photography ignore their requests.
Pretty much along the lines of asking someone for a date, and that's just one form of rejection, all the subjective comments and opinions about a model, a photographer and their work by perfect strangers will lead to further rejection. When what you do is in the public eye, there will be those that will feel compelled to seek you out so they can let you know just how they feel, good or bad.
Harmony & Me
You have to really love what you do or enjoy rejection because once you reach the point that you believe in yourself enough, you can begin sending work to juried gallery shows and publications calls for work, where a 5% acceptance rate is considered awesome. And to me this only means one thing, never give up.
"Through my illness I learned rejection. I was written off. That was the moment I thought, Okay, game on. No prisoners. Everybody's going down." ~Lance Armstrong