As of my last knowledge update in September 2021, there was no widely known or confirmed information about a significant feud or intense dislike between Greg Norman and Rory McIlroy. The relationship between professional golfers can be complex and competitive, but any specific reasons for animosity between Norman and McIlroy would likely be speculative or based on rumors.
If there have been developments or publicized events after September 2021 that have shed light on a feud between Greg Norman and Rory McIlroy, I would not have information on those specifics. It’s important to verify the latest news and updates from reliable sources to understand the current status of their relationship in the golfing world.