The Wales international struck twice as Wrexham overturned a 3-1 deficit to claim their first win in six Sky Bet Championship matches with a thrilling 5-3 victory at Stok Cae Ras.
Moore’s goals came against the backdrop of criticism he faced during an underwhelming spell at Bramall Lane last season.
The 33-year-old, who left United in the summer, had been a target for sections of the Blades’ support after a mistake in last season’s play-off final, but he responded emphatically on this occasion.
“You get criticism, you get praise. You need to keep on an even keel. You can’t take it too harshly, and you can’t take the praise too big,” said Moore.
“But I’m delighted for myself. (They can) keep saying what they can say, and I can just keep producing on the pitch.”
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Asked whether that criticism had fuelled his performance, Moore added: “Yes, absolutely!”
The visitors had made a blistering start and appeared to be in control early on. Patrick Bamford struck twice inside the opening quarter of an hour, either side of a Tyler Bindon own goal, and Callum O’Hare’s effort made it 3-1 to Sheffield United.
But Moore hauled Wrexham back into contention before the break and the momentum swung decisively in the home side’s favour when Ryan Longman levelled.
Moore then completed his brace to put Wrexham ahead for the first time, before Josh Windass sealed a remarkable turnaround from the penalty spot.
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Wrexham manager Phil Parkinson felt his side’s approach was eventually rewarded despite their early defensive lapses.
“I think we played well in the first half but those three moments we could do better with, albeit Bamford is a really good player,” said Parkinson.
“We said to the lads at half-time we had to defend our box better, we were up against a high-calibre team. But we felt that if we carried on playing in the way we had done that chances would come to us and we’ve taken them.”
He later reflected on the chaotic nature of the contest and praised several individual contributions.
“It was a strange game! Even at half-time I thought we'd played reasonably well, taking the goals out of it.
“We could have done better, but it was good movement from Bamford for two of the goals they scored,” Parkinson said.
“I always felt we'd get chances. We got back in the game well and then we just had to defend better in the box, which we did second half. The moments came our way and it's a terrific win for us.
“Our front three were great and they worked hard for the team. I'm so pleased for Kieffer to get his two goals, and Josh obviously his first finish was great. Broady looked like he could create all night for us.
“And then there was George Thomason playing wing-back for the first time and he looked outstanding for us.”
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Sheffield United boss Chris Wilder cut a frustrated figure after seeing his side surrender a commanding position and was left lamenting both the defending and the departure of Moore, who he believes would still be at Bramall Lane had he been in charge at the time.
“It had nothing to do with me but I know what he’d be doing now, and he wouldn’t be wearing a Wrexham shirt,” said Wilder.
“I think it might have changed a few people’s views on him, and the importance of him last season and the importance of him for the home team today.
“The timings of goals were really poor. We have to get both parts of the game right, and we certainly didn’t, but Kieffer has done what Kieffer does.”
Wilder was also blunt in his assessment of the overall performance.
“You can't concede five goals at any level of football and expect to get a result. It was all self-inflicted, and from our point of view the goals are really poor ones,” he said.
“We just couldn't handle their front three, and Kieffer does what he does. We didn't deal with it.
“We've come away from home and not got what we've wanted. I won't use any excuses. We'll concentrate on ourselves, reset, dust ourselves down and go again. We've just got to defend so much better.”
Despite the defeat, Bamford’s double continued an impressive short-term spell with the Blades, and Wilder hopes the striker’s stay can be extended beyond New Year’s Day.
“I can’t really do anything about it. It’s with the owners and Pat,” Wilder added.
“He’s done what he needed to do, from our point of view. He’s been really good on and off the pitch. He’s produced really top performances.”
