I wouldn't worry too much. Drunken assholes exist everywhere and rarely need any particularly reason to act out. Plus, you have a couple of advantages where you live. For one thing, Texans in general are pretty damned polite. While there are plenty of assholes here, they're just as likely to go nuts because you were only driving 58 in a 55. And for every one of them, there are 3 nice families that just want to get along and talk about lawn care and child-raising. Also, you live in one of the most liberal cities in Texas. I'm not suggesting that nobody will take notice that you're Egyptian because they will. It's just that most of them will be civilized, ask silly questions like "do y'all really think cows are Gods?", and otherwise be mindful of the Golden Rule.
Now I would certainly exercise some caution, but that's standard advice that anybody should take. The world isn't safe and there are people who will fuck you from all races. Just SOP in my opinion.
By the way, your Muslim friends are probably making a pretty big mistake keeping their kids out of school. They're preventing themselves from blending into a generally decent society. The single best way to gain allies is to have school dealings. Meet a bunch of the other parents from the school and become one of the gang. If somebody fucks with "that Muslim house that keeps to themselves all the time," it won't be particularly cared about. If somebody fucks with the Sawalhas, "little Hosni is in my son's 2nd grade class," that's a whole different story. They'd have tons of support from people who see them as decent folk just trying to raise their kids.
Lastly, I suspect most of the vandalism and mischief is perpetrated by youngsters. Teenagers are stupid and don't think twice about acting like racist fucktards. Both applied to me when I was a kid. It's just something you have to grow out of.