Not all inequity is social and legal. A lot of inequity arises from inequity of output. An engineer for La Marzocco can make improvements to an expresso machine that improves the productivity/quality output of every barista using a La Marzocco machine such that they can pour a better latte and get more tips. Since there are hundreds of thousands of baristas that benefit from the changes of that engineer (or team of engineers), it is reasonable for there to be extreme inequity between baristas and the engineer that improved the productivity of many many baristas.
I honestly don't see why people are so uncomfortable with inequity. A worthwhile thought experiment is to imagine a world with perfect equity across everyone in society. Once you consider the consequences of perfect equity, especially second and third order effects, it gets pretty dystopian pretty fast.
For example, most of those with the most talent to offer to improve the lives of everyone else cease to pursue vocations where they provide the most value to the world. Instead they pursue vocations they enjoy or find easy if they pursue a vocation at all. If there is perfect equity, why work. The pace of improvements in quality of life across all society would slow to a crawl, if not stop or possibly even reverse.
Seeing as all humans, regardless of where you are in society today, are all basically on a hedonic treadmill and are most content when they see improvements in their circumstances over the course of their life, perfect equity would be a disaster. The only exception to this would be maybe someone who has reached a Daoist/Buddhist level of contentment in all aspects of how they experience and interact with the world.
To be clear, I'm not arguing that extreme inequity is good either.
Instead what I'm saying is that inequity can be benign or even beneficial and that the ideal outcome for the most people is achieved when the power law distribution of inequity isn't extreme. e.g. a distribution of -10/x is preferable to a distribution of -1/(10x). The more smoothly sloped the power law distribution of inequity (less extreme tails), the more room there is for individuals to experience gradual improvements in one's circumstances and the more clearly does a individual experience a positive relationship between effort and reward. Experiencing an improvement in one's condition and have stewardship over that improvement both contribute to being content wherever you are on that distribution.