AJ Styles showed up at the WWE Performance Center on Tuesday, December 21 ... but he wasn't there for a workout. Instead, "The Phenomenal One" was there to confront the most hated man in NXT; Aussie upstart Grayson Waller.

It all went down on this week's edition of NXT 2.0 when Styles appeared on a WWE developmental show for the very first time to give Waller a dressing down. Waller, who earned the ire of the entire NXT locker room when he interrupted Johnny Gargano's departure speech a few weeks ago, has been roasting Styles on social media over the last few days. As a result, Styles put Waller on notice and told him to expect a visit soon.

In case you missed it, Waller senselessly attacked Dexter Lumis with a steel chair following Dexter's victory ver Trick Williams on Tuesday. As Waller gloated from inside the ring, live footage of Styles arriving at the Performance Center appeared on the screen. The arrogant Waller didn't look perturbed in the slightest.

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Following a commercial break, Styles made his way to the ring and came face-to-face with the dude who insulted his hairstyle on Instagram earlier in the week. Waller and Styles went back and forth on the mic, with Styles attempting to bury Waller by pointing out his shallow attempt to get a rub from a bigger star. Waller talked a big game and threatened to "end" the former WWE Champion.

The situation almost got physical, and Waller even took off his shirt in an attempt to goad Styles. When Styles called his bluff, Waller backed down and left the ring, telling Styles that he wants Omos to take care of Styles first.

As you might recall, Omos and AJ split on the latest edition of Raw after AJ loudly chastised Omos and Omos retaliated.