(1) God said all that to him? Doubtful.
(2) An anecdote doesn't negate all the other evidence. You can hardly say that the reason all people are sick is because they "are used to it." That's absurd on it's face and it's completely unfair and ingores the people who live with lifetime ailments and would love to not-be used to it. For example, if someone has Parkinson's disease, the problem isn't that they just got used to it. The problem is with cells in their central nervous system - hardly something they have control over.
What do you say to those Christians living in abject poverty and misery throughout the world? Or we only talking about Christians in the western-industrialized world? As far as I can tell, there's nothing necessarily wrong with being well-to-do, especially if you've earned it through your own work and efforts, but it's hardly warranted to say that the poor are that way because they are "fine with it." Most of the poor in the world are poor for reasons beyond their control - they don't have access to good education, they don't have access to good paying jobs, they can't finance major purchases, they spend the majorty of whatever income they have on basic necessities, they don't have access to proper sanitation, they have inadequate health, lack proper food, and they generally are not exposed to and afforded the same set of opportunities that those in the western, industrialized countries are afforded.
This isn't to say one is right or wrong for being rich or poor, but we should realize that there are people in the world, Christians included, who live in abject poverty for reasons beyond them "being fine with it." Many, if not most, of these sorts of problems in the world are systemic and beyond the control of the individuals living in poverty. Only in the western world could someone conclude that God wants everyone to be financially well off. Reality spells out something different.
Last point, Ecc 5:18-20 is about enjoying the fruits of your labor, not some inherent right or God-willed situation where everyone is assured or even afforded the opportunity to be well-to-do financially.