Did he? What about his 64% pass completion, which was only better than Moura and Gazzaniga (and significantly worse than Sissoko's 85%, for example)?
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A lot of excuses being made for him in this thread by some - it's Sissoko's fault, or Eriksen's fault, or KWP or Rose's fault. Occam's razor boys - it's okay just to admit that Dier played very poorly, likely because of his own limitations and/or poor form. And it's nothing to do with him being a 'villain' - that's just lazy and defensive IMO.