A non-trivial percentage of White Americans feel like African-Americans have already been made whole for the hundreds of years of wrongdoing done to them, and some even feel like Black people actually have more privilege/opportunity than White people in America and that America is now "reverse racist". Anecdotally, they tend to be poorer Whites who feel aggrieved that they haven't gotten the wealth they feel they deserve, but not always.

Basically the type of people who think saying "Black Lives Matter" means you hate White people.

The term was coined by Publius [1] in his blog. It's resentment towards black people due a belief of having *"been significantly deprived of various things because of minorities".

Also, WaPo recently used one question from historical surveys by the ANES (American National Election Studies) to measure what they consider "white resentment", and there seems to be a large correlation between that and other political positions. [2]

(Skip to the "Here’s how we did our research" part and the graph if you're not a fan of WaPo)

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[1] https://obsidianwings.blogs.com/obsidian_wings/2008/08/my-on...

[2] https://www.washingtonpost.com/news/monkey-cage/wp/2018/01/1...