Comes from growing up overseas (I live in the US), and having servants.
These were the people that raised us, and were, for all intents and purpose, “family.”
Except they weren’t, and when I found out how they lived, it broke my heart.
I was also raised by a British mother, who was an awesome woman, but came from a middle-class Liverpool (“scouse”) family, and spent her entire early life feeling “not good enough,” despite attending an Ivy-League university, and excelling at her work (http://cmarshall.com/miscellaneous/SheilaMarshall.htm).
Knowing how she felt also broke my heart.
The British have a heavy-duty caste system that isn’t as codified as India’s, but just as pervasive.
Of course, in the US (and, I believe, in other parts of the world), we are currently facing a reckoning about another type of “caste system.”
There seems to be an innate human need to “just be better” than others. I think we all have it, and have to make a conscious effort to suppress the impulse.