Two seperate issues. Conor said he would beat all those WWE guys and called it "fake". Again, in the words of Vince McMahon, "It's a soap opera for men, you don't call Shakespeare fake".
I think people understand that it is scripted and the winner is predetermined (there have been many "legit" MMA matches that have been works as well).
The second issue is that many of those guys were legit wrestlers in college and in some cases Olympic caliber, or had other training in combat sports before becoming professional wrestlers. Due to their size/strength/legit training, I think most of them would tear Conor apart, "fake" or not. Bautista is a legit BJJ brown belt for example and was a former MMA athlete. Kurt Angle was an Olympic gold medalist in wrestling. I don't see how Conor at 5'9 and 170 stands up to Bautista at 6'6 and almost 300 lbs. Reminds me of when Rousey said she could beat Cain Valasquez when he was HW champ. Just more running of the mouth to make a name for himself.