Every week, rejection letters from my past. Because the hurt goes away after a couple of decades.
Take a gander at the pretty blue rejection slip. Really read it.
Notice what it says?
They can only publish one percent of their submissions per year. And they receive 5,000.
The next time you complain about not getting a fair read from an editor, bear in mind two things: First, they receive vastly more submissions than they could ever publish. And second, how sane and fair would you feel after reading 5,000 submissions?