2. The Iron Sheik
Former World Wrestling Federation Champion, The Iron Sheik hates Hulk Hogan to death. And apparently one day, he would “f*ck Hulk Hogan’s a** with a beer bottle” as stated by him on the Howard Stern Show.
The main reason for this hatred is Hogan not giving Sheik his World Title rematch when he lost the title to Hogan in 1984 and gave Hogan his first big break as a mega star. As said by Sheik “If it wasn’t for him, Hulkamania would’ve never existed”.
Another reason for this heat his Hogan not fulfilling the promises he made to Sheik. After Hogan won the WWF Title in 1984 by beating Sheik, Hogan thanked Sheiky baby backstage and told him that he owed him one & offered various things in return for putting him over, but never fulfilled those promises. A same scene happened later when Sheik met Hogan.
Hogan tried to help Sheik and told him that he would use him on a reality show and told his manager at the time, Jimmy Hart, to take Sheik’s phone number and he would contact him about the offer. But according to Sheik, Hogan never returned his call and screwed him over yet again.
Here’s a video from the Howard Stern Show where Sheik explains why he hates Hogan so much:

