Carrie Underwood Slams for Golf Course Performance

fans were left aghast at new footage of her playing a Fourth of July concert over the weekend in .

The 43-year-old country superstar performed Saturday at the John Deere Classic, an annual golf tournament held as part of the PGA Tour.

Online viewers expressed shock at what one called her 'horrible' rendition of her 2005 hit Before He Cheats, a vengeful power ballad aimed at an unfaithful ex.

Social media trolls began wildly circulating an unsubstantiated rumor that she was singing to a crowd of 'dozens' or 'tens' of people, while tournament officials estimated she had an audience of 12,000, according to the Quad-City Times.

Left-leaning commentators sneered that she was reaping the results of having sung America the Beautiful at 's second presidential inauguration last year.

'That's what going MAGA will do to ya!' one wrote as another snapped: 'This song doesn't hit the same ever since she sold her soul to the Cheater in Chief.'

The Daily Mail has contacted representatives for Underwood and the John Deere Classic for comment.

Another tweeted a take-off on her lyric: 'Maybe next time he'll think before he cheats,' joking: '“Maybe next time she’ll think before she votes”!'

'Never thought I'd see the day she would sound bad,' still another wrote, adding a GIF that showed Dan Levy cringing on the sitcom Schitt's Creek.