Trump is a keen golfer and McIlroy, a four-time Major winner, accepted an offer from the commander-in-chief to join him for a round at the Trump International Golf Club in Florida last weekend.
On Friday he posted a statement on Twitter responding to suggestions he had allied himself with the controversial president.
"I don't agree with everything my friends or family say or do, but I still play golf with them," McIlroy wrote.
"This wasn't an endorsement nor a political statement of any kind," McIlroy wrote. "It was, quite simply, a round of golf. Golf was our common ground, nothing else.
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"I've traveled all over the world and have been fortunate enough to befriend people from many different countries, beliefs and cultures. To be called a fascist and a bigot by some people because I spent some time in someone's company is just ridiculous."
"I really got into it once Trump ran because I knew him a little bit but at the same time I was intrigued how a successful businessman could transition into running for the highest office in the land," McIlroy told the publication Friday.
"It is a totally different process from the UK. He obviously came at it from a completely different angle. Something like this probably won't happen again in our lifetime. I'm very attuned to it, I watch a lot of news. You can't avoid it. I had no interest in politics until a couple of years ago; now I can't seem to get away from it," he said.
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