You know what, I do get nervous. And IT IS because of the color of some passenger's skin and their appearance. But it's not the dark skinned Middle Eastern pax that I worry about. It's your average white male who was able to get on the plane already drunk and then takes a swing at me because I won't serve him another Jack and Coke.
The radical Islamics who carried out 9-11 are the among the foulest creatures on Earth. But honestly, I don't see them in every person with dark skin who boards the airplane now. I don't think they would be able to carry out the same type of attack in the post 9-11 world (and if you read the news, they haven't been). They knew our procedures for dealing with hijackings before 9-11 and used that to carry out their mission. They know now that we and the other pax will never allow that to happen. We as flight attendants are the human shield in the back. I think often about the brave F/As at UA and AA who gave their lives trying to protect the aircraft and it makes me proud to have been a member of this profession.
Thankfully, I've never had any problems with a Middle Eastern pax in 11 years as a F/A. So when I see one board the flight I usually don't give it a second thought. But I've lost count of the number of physical threats, assaults, verbal assaults and confrontations I've had with white males. So when some loud mouthed guy gets on in BUR on a Friday night going to LAS, I get a little uptight as well, and get ready for the fight that may or may not occur.
Fly safe.