In fact some people in Iran are saying that Just because prophet Muhammad was sent to a tribal, ignorant people of Arabia means Arabs were who needed (and still need) guidance the most... God sent Muhammad to savage and uncivilized people of Arabia to prove to all people what they can become after being guided by his messenger...
Prophet is a miracle because he could rise among that kind of humans and convert them into what they are today from what they were.... btw, if current Arab culture is the best Arabs could become after all Muhammad's divine guidance and help...imagine what they were before Muhammad!!
Btw, if you're talking to DESI people only, then your observation is correct.... Arabs maybe see and treat some south Asian nations' people as slaves in their country but this is not the case for all nations... In fact it is vice versa in Iran... Current Arabs to the eyes of most Iranians...
Not saying all this to defend the idea but the facts are facts.. Non-shia Arabs are lowlife, uncivilized people to the eyes of most Iranians... not saying it is a right thing to do tough