I went through the same checking as these twins, already for several times, although I'm no Israeli Arab. I consider this behaviour as a legal security check which happens in other countries, too, and which serves everybody's security. The complaining about alleged discrimination of Israeli Arabis is exaggerating. Actually it's more than exaggerating, it's somehow paranoid!
Saudi Arabian king cuts France trip short after beach controversy (Reuters)
from the article: Arab Labor MK says airport security 'humiliated' her children