I have gone through it quite thoroughly and unless my memory is failing me, no. The rejections he faced are, as you say, all (again, unless I'm missing some) imagined slights against him, ranging from people looking at his friends and not him, to girls bullying him, to insecurities about his height. He regularly engages in activities with the hope of acquiring women, but repeatedly comments that he is too afraid to actually approach them, in fear of them feeling he is "worthless".
This is the first actual 'rejection', but even then it's not something that he ever stated:
then there's:
EDIT: I'm in the process of posting some highlighted versions of the manifesto (given that it's hard, making notes and taking relevent points made it easier for me to search for components) but he goes into such detail that there are a huge amount of pertinent areas, as, given the level of obsession, it seems quite clear that many, many events haunted him, regardless of how significant they were. I'll try and get a few examples of what his slights consist of when it's done.