It's a chronology thing.
Stipe has never been known - as far as I know - as an eyepoker it's entire career before Cormier.
First fight Cormier eyepoked the shit outta him, one sided cheating, and got a nasty KO out of it. Then it was on by the second fight, eyepoke galore - wich for a guy with a smaller reach isn't the greatest setting.
Not sure about the eyepoking career of Cormier before Jones, but he sure did become an eye-seeking mummy after their fights.
I guess it's like a vampiric plague, the eyepoked become a eyepoker.
Or more prosaically, the guy getting fucked other by an unpunished cheater will eventually go down the same road. No repercussions and net positive so why not ?
Plus sometimes a bit of sweet revenge.
Nethertheless, it's simply hilarious to see the new "no more eyepokes" gloves wanted from fans and clean fighters both go out of the window the day JJ comes back.
I mean, common. A bit of critical thinking. JJ is their prodigy, on the road to a flawless career on paper, and Stipe had always so so relations at best with White.