Mr. Miller set off on a patriotic semi-striptease before the editor of the student newspaper, according to the editor, Ari Rosmarin, theatrically removing a button-down to reveal an American flag T-shirt in protest of an article he found inconsistent with the national interest. (The White House denied any symbolic unbuttoning, though officials confirmed Mr. Miller’s fondness for the T-shirt.)
He jumped, uninvited, into the final stretch of a girls’ track meet, apparently intent on proving his athletic supremacy over the opposite sex. (The White House, reaching for exculpatory context, noted that this was a girls’ team from another school, not his own.)
Most memorably, classmates say, Mr. Miller established a reputation for barreling eagerly toward racial tinderboxes, leaving some to wonder whether his words were meant to be menacing or hammy. Jason Islas, who had been friendly with Mr. Miller in middle school, has little doubt.
Shortly before the start of ninth grade, Mr. Islas said, he received a call from Mr. Miller informing him that the two could no longer be friends.
“He gives me this litany of reasons,” Mr. Islas said.
Most were petty, if mean, he recalled: an insult about his social awkwardness, a dig at his acne-specked face. But one stuck out.
“He mentioned my Latino heritage as one of the reasons,” Mr. Islas said. “I remember coming away from the conversation being like, ‘O.K., that’s that.’”