Because she said "aren't". you idiot wingnut.
"Hillary Clinton called for raising taxes on the “middle class” while campaigning in Omaha, NE. Joined by left-wing Democrat billionaire Warren Buffett, she received applause from those in attendance.
“Because while Warren is standing up for a fairer tax code, Trump wants to cut taxes for the super-rich,” said Clinton. “Well, we’re not going there, my friends. I’m telling you, right now — we’re going to write fairer rules for the middle class and we are going to raise taxes on the middle class!”
Social media users sharing this video offered it as evidence that Clinton had actually promised to raise taxes on "the middle class but not the rich," that she had changed her tax platform, and/or that she had let loose with a Freudian slip and accidentally revealed the truth of what she was really thinking.
Some viewers defended Clinton by saying that the clip had been edited, but it was not. The footage was taken from a speech Clinton delivered during a campaign stop in Omaha, Nebraska, on 1 August 2016:
This from Snopes.
Hillary Clinton: 'We're Going to Raise Taxes on the Middle Class'
They did what they always do for a Democrat later in their statement and made up several excuses for Hillary.