Forgive me if I misunderstand but we're talking individual 'income' tax rates.
It's been awhile since I was looking at the differences between standard corporations and LLC but the data that stood out for me was that as an LLC owner, you file your LLC income as a part of your personal income, rather than filing separate returns for your personal income and your business.
Therefore anybody operating an LLC that earns $250,000 a year would be hit with the higher personal tax rate.