One thing you can count on in 21st-century U.S. politics is that Republicans will lie about taxes. They did it under George W. Bush, they did it under Barack Obama and they’re still doing it under Donald Trump.

Yet this time is different. It’s not just that the lies have gotten even more brazen. There’s now a combination of incoherence and rage that we, or at least I, haven’t seen before. These days, they can’t even seem to get their fake story straight — and they literally start yelling obscenities when someone tries to point out the facts.

G.O.P. lies about taxes generally involve two issues: who is hurt or helped by tax changes, and what these changes will do to the budget.

Thus, when George W. Bush cut taxes in 2001 and 2003, he and his party repeatedly insisted that the tax cuts were primarily for the middle class. In fact, while there were some middle-class tax breaks in the package, such as an increase in the child tax credit, these were dwarfed by cuts in tax rates on high incomes, reduced taxes on dividends and repeal of the estate tax. Over all, the richest 1 percent saw a much larger increase in after-tax income than middle-class families did.