How so? I never said you weren’t supposed to feel bad or that you couldn’t. Lick your wounds if you want. Just don’t lash out over it.
It will make you a genuinely more likeable person if you don’t lash out at someone for rejecting you. No sane person wants to date an individual with a temper like that, especially if you put it on display before the relationship even begins.
I would never defend or say that behavior is justified by hurt feelings. I am saying that just saying “just don’t take rejection personally” is in no way a helpful response. To misquote Schoppenhauer, a person can choose how they react, but they can’t choose how they feel – especially when hormones are involved.
I never said anywhere that you shouldn’t take the rejection personally though, nor was it implied.