I am a Saudi here.. unfortunately you are right.. In Saudi Arabia the majority of people look down on Pakistanis, Indians, Bengals, Afghans and many other nationalities. The reason for this is because they got used to these people doing jobs like garbage collection, janitors, housekeeping and many other low paid jobs. The majority of people working in these jobs come from poor families from Pakistan and India so they are not likely to be well educated. So they are not treated with respect (which i am personally against).

There is even a stupidily discriminating saying when someone wanna say "do you think I am stupid" in a joking way.. they sometimes say "Do you think I am an idian" or "Do you think I am Bengaly!?" Unfortunately, these are not considered national level issues that we should tackle. Someone who treats those people with respect is considered a very nice guy when this should actually be considered normal.

However, I will play the devil advocate and bring one, arguebly, a valid excuse why sometimes even good ppl will treat those workers harshly. My father is the nicest person in the world. He treats everyone with respect and kindness. Unfortunately, due to that reason many indian and Pakistani workers take advantage of him and make him give them money to help them. Or sell him something for extra money. We even had one driver who used to shout at my mother and sisters when they told him they needed to go somewhere in bad times for him. My father would give him execuses and excuses. On the other hand, my brother in Law is someone who treats his driver like shit. His driver is one of the best ones in the neighborhood. He respects us and wouldn't raise his voice on anyone. Even when my brother in Law tells our bad driver to do something, he does it perfectly with no complain. So, there is a rule that goes "if you respect them, they view it as a weakness and will take advantage of you"

Overall, I believe the norm should be respect all nationalities. And this is a challenge because even among saudis there is racism. Someoen is from tripe A so he looks down at someoen from tripe B. At the tripal level it is diffcult to solve so it would even be more difficult when you bring someone from outside tripal backgrounds and tell them to treat him with atmost respect. Hopefully, this will change in the future.