They have a very similar one at Kohl's. The logo is smaller and on the chest where a name tag would be.
The guy should've responded "As you wish!" And whipped it off!
Now that would have gotten attention.
I do wonder about some folks these days. Where has the good pop culture knowledge gone? Princess Bride was one of the best movies of fantasy comedy. Right up there with Stardust. Both are on my "Watch During a Rainy Afternoon" Playlist.
The shirt wouldn't have bothered me at all. I'd be that passenger sitting next to him cracking up laughing and making movie quote jokes through the flight.
My guess is the flight attendant got schooled on the movie so didn't bother returning. Would have made her look woefully naive.