I don't think the parent comment was actually agreeing but instead of mocking Donald Trump's response to Hillary's comment about him not paying federal income tax. But I could be wrong.
I suspect the comment you replied to was also quoting Trump, specifically a moment during the first debate when he leaned into the mic and whispered "wrong" repeatedly to counter something Hillary had said. Surprisingly, I can't find the gif right now considering how rampant it was.
Atttibuting 1-word quotations is a guessing game, I might as well be...wrong
