When I graduated and moved off campus I almost exclusively ate kraft dinner, canned tuna or salmon and bananas from costco. I had to choose between having somewhere to live and having something nutritional to eat. The thought of eating kraft dinner now makes me sick to my stomach.
I think a lot of the hate is from people who ate way too much of it when they were poor and growing consumer awareness about the health risks associated with eating ultra processed foods that are high in sodium and saturated fats.