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Being poor correlates with adverse health outcomes. If you insist (as you do) that those health outcomes are due entirely to culture and willpower, then you are forced to conclude that poor people have low willpower and are less moral. This is an unprovable assertion, based entirely on your own vibes, and is frankly a cruel thing to say. It basically asserts that these people deserve the things that happen to them, because they were avoidable and entirely due to their choices.

This is not a celebration of human agency. When people are treated badly, they behave badly. It is completely irrelevant that you were treated badly and happened not to behave badly. People are far too complex for you to say "well, we got treated the same, we should have behaved the same".