Reason given: Hurt feelings.
Via Mediaite:
A nine-year-old in Fresno, California, named Logan Autry was asked by school officials to remove his Donald Trump hat because it, in his words, “brings negative emotions to the other children who don’t like him.”
The third-grader’s “Make America Great Again” hat is even autographed by the business mogul himself, so it makes sense that the child wore it three days in a row.