The guy is a moron. But what business is it of the screener who a note is written to? In this case I assume the moron was mouthing off for a stupid intrusive question. Was the note a threat? It didn't say it was a threat.
The world is made up of morons. Unfortunately, sometimes they even work as airline screeners.
Seriously, how long do you think this man was searched?
They obviously read the mag before they waved the wand. I wonder if they've ever heard of the word "bottleneck"!