Is "muslim clothing" an accurate indicator of malicious intent? Weren't the 9/11 bombers clad in polo shirts and khaki Dockers? Wouldn't a turban or a burkha be the last choice of a terrorist?
There's nothing wrong with Juan or any of us feeling uneasy while boarding a plane with someone in "muslim clothing", but most of us have more brains than to act on that impulse, or even talk about it in a public forum.
Juan's comments, while honest, contribute to the perpetuation of a stereotype that is unhealthy for us all. It goes hand-in-hand with Republican propaganda against the Mosque near the site of the 9/11 attacks, which stated that "first they attacked us, now they want to build a memorial on the site of the attack." Not an exact paraphrase, but damn close. Like I said, it's unhealthy. But more than that, it's just plain stupid.