@freemo Assuming you mean the poor hating the rich and not the rich hating the poor which happens in all forms exploitation for profit. Hate is a strong word, but one person regarding another person lesser than themselves based on their wealth alone.
The majority of rich people were born into their wealth which gave them more opportunities starting out, as well as most poor people were born in poverty which gave them less opportunities in life. There are exceptions, but those are few.
I don't think this is about hating rich people, but rather about being trapped in a system designed to give more power and control to rich people so they can exploit more poor people for profit. People in general knows that money brings power, and when treated unfair it's natural to blame those in power.
Imagine for a moment that you are poor, you have experienced family members die because your family couldn't afford proper medical care, and every day is a struggle to earn enough money to eat. You hear the news about rich people dying on an adventure cruise that cost millions, willingly taking risks to enjoy themselves and perhaps have something to brag about at the next cocktail party . How would you feel about it?