You're arguing the old maker versus taker canard, which doesn't reflect reality at all. Taxation would not exist without the consent of a large number of economically productive taxpayers. If you think politics in the United States is run by poor people, or by mysterious forces that somehow nullify and overcome the economic power of a preponderance of American taxpayers, you are kidding yourself. You'd be better off engaging with American taxpayers who want the government to play a certain role and want to pay for it than pretending we don't exist. If you persist in believing that government is a conspiracy by parasites against the productive, then you are going to be perpetually confused and disappointed by American politics. Warren Buffet is trying to help you out, to clue you in to the fact that the politics surrounding government spending and revenue are not determined by the economic divisions you think they are. Accept that a large number of prosperous Americans (such as Warren Buffet) are willing taxpayers who approve of many forms of government spending, and I promise you, things will become a lot clearer. You might even be able to frame your arguments in a form that a presidential candidate wouldn't have to apologize for repeating.
I don't think the majority of people who politically support the current tax code are currently making as most of their income and a sizable portion of net worth 50-500k/yr in wage income from non-government (direct or one level removed) sources, however.
(it's primarily retirees who are now a combination of state beneficiary and investment income earners, people who work for government or direct vendors to government, and is funded by people who make most of their money as capital gains or carried interest.)
This is true for both major parties, and has been true for at least 40 years, though.
Socially and intellectually, the people I mostly identify with are professionals and other middle to upper class wage earners (doctors, lawyers, engineers); the exception being startup equity. And the people who earn wages (vs. capital gains) in this bracket pay the highest marginal taxes of anyone.
If tech people weren't able to shift income into capital gains, 50%+ taxation would be a much bigger deal.