Why do some Arabs become ashamed of who they are if they get to be known in the US?

And notice that the word "Arab" is not even used. "Q: Egyptian is certainly a more unusual ethnicity here in the U.S. Do you have any specific traditions you celebrate, or unique Egyptian practices?
Hoda: My parents raised us red, white and blue. You know a lot of immigrants from that generation wanted their kids to be only red, white and blue. You're going to play baseball, and here's some apple pie. We were raised in that whole tradition of everyone acclimating. My parents felt that they picked this country, and we were going to be like the people in this country. I don't think we lost our uniqueness though. We still have different stuff that Egyptian people eat or drink or do, and we celebrate those things. And we have a bond... I'll get voicemails sometimes from people I don't know saying "We're so proud of you! We're Egyptian!" And I'm like "OK!""