Yes it's true - also when you cross you leg - never let them see the bottom of your shoe- it's considered an insult as if you are above them and that they are beneath you.
Thanks....It always bugs me when I see these pics of Arabs giving us the thumbs up and we take it to mean, "Good Job!"
For the time I was over there (6 months) I found them to be the most disingenuous people I have ever met.