Is it just pure racism? Is it just overall hatred of poor people? Some combo of the two?

Combo of the two. There’s plans to build condos near my home and my dad flew off the handle at the news because he thought it was affordable housing when it wasn’t. No kidding he literally said along the lines of “I didn’t move out of the city to have n-words come live near me”. He’s a racist piece of shit who’s lizard brain is on that white flight.