Paraphrasing: Muslims who invaded/robbed the subcontinent were ALREADY divided into vocation based social "classes" , including priests, nobles and others. Further, a racial segregation demarcated the local Muslim converts from foreign origin Muslims . The foreigner Muslims claimed a superior status as they were associated with the conquerors and categorized themselves as Ashraf ("noble").

Remember two things before you post next time:

1. Wikipedia is well-cited, and social strata issues are rampant amongst all people, including Muslims.

2. Messenger of Allah said “Even if he observes Saum (fasts), performs Salat (prayer) and claims to be a Muslim, the hypocrite does three things: When he speaks, he lies; when he makes a promise, he breaks it; and when he is trusted, he betrays his trust.”

Awaiting your well-cited rebuttal, ComputerGuru.