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Rejection is the equivalent of quality control for human relationships, if you want quality relationships not only you have to be rejected but you also have to reject people.
Not only the rejection in the beginning, like choosing with whom to go on a date, but also while you are in a relationship.
Paradoxically this creates a bond, between the two parties. In order to have a bond you need boundaries.
Rejection is part of the negotiation process, it is the part where you find the common ground, the win/win solution to the challenges of life.
Without rejection there are no clearly determined boundaries, if you are going to have any relationships at all they are going to be win/lose because the other party is going to get compliance from you. Which is not going to earn the respect or love of the other person, because there is no exercise of virtue.
I don't know if you are aware with the concept of negging from the pickup artist community, that in order to spark attraction in a woman you have to playfully reject her. That technique is a form of manipulation of the natural self preservation instinct of rejection. It is a way to create the illusion of a bond in people that are a little bit more weak minded.
The entire pickup artist community is missing the obvious point, sex is a natural consequences of intimacy, this is why we use the word intimacy as a euphemism for sex. The reason why some man can't have sex is because they lost their capacity to be intimate. Learning manipulation techniques to create the illusion of a bond serves as a form of denial for your pain and true issues.
Rejection expressed in a healthy way should come from intimately asserting your needs, rather than as a tool to trigger attraction in the other person.
But expressing yourself for who you really are means also accepting the fact that you are going to get rejected, not everybody is going to be willing to cater to your needs. This is how negging you are trying to reject others to make you like you so you don't have to be rejected. It is a form of denial of rejection.
Denying rejection has the horrible disadvantage of the fact that it makes it impossible for you to have healthy win/win dynamics with other people. Which is going to significantly shrink the pool of people that you can be friends with or date, because sane people are going to reject you. Also the relationship you will have are going to have a lot of unnecessary drama because of their dysfunctional nature.