This just unlocked a core memory from when I had a temp job in high school at a major banking Corp and for whatever reason had to take their course on mortgage lending stuff.

At one point the instructor asked which out of the things in the slide was discrimination: refusing to lend to someone based on their race, their gender, their income level, their religion. I answered all of them and was gently corrected. The right answer was of course that all except income level was discrimination because poor people are not a legally protected class.