Hello there, I wanted to ask what Islam’s view of the Muslim caste system is, I have seen an overwhelming amount of Muslims here in Pakistan discriminating against fellow Muslims based only on the fact that they are of a lower caste, such as denying them services, being rude and have preconceptions about them such as how some caste will always backstab or how some will never want to spend a dime, or even going as far as saying “shaitaan bhi shaikh we acha/bharosedar hota hai” which is baffling to hear since in hadith the people who convert to Islam from some other religion are celebrated, but here in Pakistan any hindu converting to Islam is given the cast “shaikh” and set to be discriminated against by fellow Muslims.  
 
What is Islam’s view on such matters?