The incident occurred after Thomas missed a hair putt during the third tournament at the Sentry Tournament of Champions in Hawaii.
“I’m an adult. I’m a grown man. There’s absolutely no reason for me to say anything like that.
“It’s terrible. I’m extremely embarrassed. He’s not the kind of person I am … But unfortunately I did and I have to do it and I’m very apologetic.
“I deeply apologize to everyone and anyone I have offended and I will be better because of it,” Thomas added.
“As he expressed after his round, we agree that Justin’s comment was unacceptable,” the PGA Tour said in a statement to the AFP news agency, which added that Thomas is likely to be fined for “inappropriate behavior.” to a professional “.
Entering Sunday’s final round, Thomas is tied for fifth, four strokes behind co-leaders Harris English and Ryan Palmer.