I Always give reasons, to them, at the time, if I know them.
There's a real reason. Maybe my perception is bad, maybe they misspoke, maybe they can explain something...
I don't want to be a fool and let a his candidate go.
I'm really picky but I'm also extremely forgiving and believe in improving the person and making it a beneficial experience regardless of the outcome.
Other people don't do this because I dunno, my pet theory is most people forget to be adults