I think you are taking these arguments too literally. The issue isn't inequality in itself, it is the degree to which inequality exists. Wealth inequality in the US is at all time highs. Part of this is due to globalization and technology, but a good part of it is also attributable to record low tax rates and business friendly government policy. Meanwhile, tuition at the public university I attended has increased by 400% in the past 10 years.

I don't think anyone cares about rich people driving fancy cars. They can spend their money how they like. Additionally, I don't think we will ever get rid of poverty entirely. The implicit agreement that we have reached as a society is that as long as the government ensures equal opportunity and social mobility, we will tolerate a certain degree of wealth inequality. Unfortunately, that inequality is so extreme that it is negatively impacting opportunity and mobility.