You say 15 years, I have been here for all my life, 25 years. I am an Iyengar who has grown up in Old City in Hyderabad amongst Muslims. Your statements are libelous at best. There are few who tend to behave in such manner, but they are from both religions.
You talk of arrogance, I really doubt if you are a Hyderabadi, they are the best hosts. And you talk of credit cards and other things, dude, go get some gnan as to how would people without the money for basic amenities would be. Its not just Hyderabad and Muslims, there are several parts in Northern India, wherein such behavior is prevalent irrespective of religion. Being a banker, I have seen several cases.
Don't try to bring a divide through libel, if you are a Hyderabadi you shouldn't be.