This is complicated, but here goes :
-Y-DNA genetic haplogroup J1 is mostly dominant in Arab countries compared to anywhere else in the world. This suggests that J1 is associated with the spread of Arabization in the past, in which Arabs from Arabia invaded other parts of Middle East and North Africa. Yemen and Southern Saudi have the highest percentage of J1. As it gets further more Yemen, the percentage of J1 gets smaller.
-The second most common Y-DNA haplogroup is J2. J2 is the closest haplogroup to J1, but there are some differences. Carriers of J2 tend to have bushier eye brows (And more chance of having unibrow), lighter skin, wider mouth, and shorter upper head. On the other hand, carriers of J1 tend to have almond-shaped eyes, darker skin, and thinner eye brows. Apart from Yemenis and Southern Arabians, most Arabs in Middle East carry both of these 2 haplogroups in nearly similar percentage. Levant Arabs have the highest percentage of J2, which explains why they have the lightest skin among all Arabs.
-The third most common haplogroup is E1b, which is dominant in North Africa. North African Arabs are mixed with Berber people, who are though to contribute the most to E1b. Berber people in North Africa carry higher percentage of E1b. Morocco and West Sahara have the highest percentage of E1b, which, at the same time, they're the furthest North African countries from Arabia. There have been migrations of Arab tribes from Yemen to North Africa, which explains why the portion of J2 in North Africa isn't as many as in Levant. In Arabia, Arabs carry a small percentage of E1b, except for the Afro-Arabs (Black Arabs who were imported as slaves in the past.).
-J1 in Europe is very rare, except in Sicily, which is Italy's Southern region. This is because Sicily was an Arab colony. Certain parts of Spain also have significant percentage of J1 due to Arab rule in the past.
-J2, on the other hand, is quite common in Southern Europe. Many Italians and Greeks carry significant portion of J2, as well as certain parts of Spain. J2 is also dominant in Turkey. In Balkan, Russia, and Ukraine, J2 is also quite visible enough due to Turkic invasions.
-E1b is also quite visible in Southern Europe, but not as much as J2. Certain parts of Spain and Portugal have significant portion of E1b because parts of Spain and Portugal were colonies of North Africans.
Are the Arabs white enough ? It is up to you to decide.