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Taylor Swift's "Eras" tour has seemingly lost its luster, 'cause Swifties are now roasting their idol ... specifically, over her attempts to cut a rug on the big stage.
The Grammy winner's dance moves are being called out online -- all because of a viral clip that captures Tay Tay swiveling her hips like it's 1958 ... this while she was doing one of her big concerts in Edinburgh earlier this month and gyrating to her song "Fearless."
Watch .