Algerians aren’t even Arab they’re Arabized Berbers so that’s weird they think they’re Arab. As I previously said the role of father is key.My cousins are mixed with Algerians and they have practically assimilated in their culture and ONLY have Maghrebins as friends. They practically think they're full Arab so I don't bother with them.
Just look at Maya Jama(half Somali/half White) she was raised by her white mom all her life while her father was in jail, so it’s no surprise she knows very little on her Somali heritage.