You should always…
Upon receiving a rejection maintain a dignified air
True, there is nothing wrong in a small private release and annoyance
Upon receipt of that rejection notice….
You might even indulge in a modest amount of arrogant dismissal of the opinions voiced there in….
(Women writers are advised not to don a moustache and beard while doing this as it detracts from the overall aura of that most devestating of weapons……female distain)
However once the disappointment and annoyance are out of your system…
And you have returned to equilibrium
Behind every successful writer are editors who rejected their work and would now rather not be reminded of it