It turns out that Gazans call black-skinned Gazans "slaves". I've met black-skinned Bedouins but not black-skinned Gazans, and I don't know if the black-skinned Gazans are also Bedouins. I actually didn't know the word for slave in Arabic, but it was similar enough to the word in Hebrew that I was able to figure it out. I'd later have it confirmed. Not only do they called the black-skinned Gazans "slaves", they treat them as such as well. No lack of colour-motivated racism in the Gaza strip. Yes, I speak with Gazans in Arabic, and before October 7th I'd have conversations with them face to face.
As for Israeli racism - I think that we're the only country in the world who went out to help dark-skinned people immigrate en masse. Israel has a large Ethiopean community. I've had Ethiopean commanders in the army, and I work with quite a few Ethiopeans. I don't feel that they treat me in any unusual way, nor do I treat them in any unusual way.