> school where 80% of the students were descendent of North African immigrants, mostly from Algeria.

Ah, the Colonial power structure. A gift that keeps on giving. But tribalism runs deep too.

> in the Bay Area. Nobody cares about my accent here

For the most part in the modern US, money=caste. Tribalism still runs deep (see: US politics) but how people pronounce isn't such a factor as it can be in the EU and in the UK.

As you are probably aware, French in Canada is also a many-caste system.