Upzoning does not cause displacement.
edit: Seriously: with metro-wide upzoning we are talking about allowing single family homes owned by primarily whiter and wealthier residents to be replaced with smaller unit apartment buildings more affordable to the less wealthy.
You need to read the Color of Law by Richard Rothstein and gain a better understanding of the truly racist and segregationist history of our current exclusionary zoning policies which upzoning would replace.
A lot people willfully misunderstanding the story in the comments here. No one is saying "pOllUtiON iS rAscISt". They're saying that racial segregation causes a number of problems to disproportionately effect minorities, which is true and well-documented. I would highly recommend anyone interested in this topic read The Color of Law by Richard Rothstein, which lays out in meticulous detail many of the ways segregation still impacts minorities in the US.