You aren't reading very closely. In vivo desensitization is what you're describing - slowly facing your fears piece by piece. Rejection therapy is something e

You aren't reading very closely. In vivo desensitization is what you're describing - slowly facing your fears piece by piece. Rejection therapy is something else, where you actually attempt to be rejected X number of times per day. If you aren't rejected, you now have to do something that will get your rejected. It is essentially a defence mechanism to avoid true vulnerability.