I'm well off, and eat lentils and rice on the regular. So do all my equally comfortable friends, whether it's from a healthy "whole foods" kind of mentality or just an enjoyment of tasty food.
When I talk about food with my family who is lower income, they often dismiss those kinds of foods as being "poor people food" even to the extent of throwing a bit of shade when I send photos of lentil dishes I've prepared. They feel that because they can afford fast food and eating out, that they should almost like a weird wealth display. Their idea of treating someone to a good meal is a trip to a slightly nicer fast food restaurant.
Obviously, this is a small sample size and is tied to my family so this is likely not a comprehensive answer but it's at least my observation on the matter.