Bryson DeChambeau has let it fly recently. Not the golf ball — his emotions.

The 24-year-old is being criticized for blowing off the winner of the Porsche European Open, Richard McEvoy, after shooting a disastrous six-over 78 in the final round. It was just one incident in a series of recent controversies that have engulfed DeChambeau.

DeChambeau finished in a tie for 13th place after entering Sunday’s final round with a share of the lead. He exchanged only a brief handshake before blowing by McEvoy, his playing partner, in what is being described by one player as a “classless” act.

“Has to be said, as far as classless handshakes go, that was a good’n!” Eddie Pepperell, who finished sixth at the British Open, wrote on Twitter.

DeChambeau had been leading late in the final round, but his game started to crumble with five holes left. He shot five-over in those holes, including a triple bogey on 18.

He later apologized to McEvoy, who sank a 20-footer on 18 to win the event, in an Instagram post.

“I apologize to Richard McEvoy and the fans for my brevity on 18,” DeChambeau wrote. “He is a class act, worthy champion and I enjoyed playing with him the past two days.”

DeChambeau, who majored in physics at SMU and wears a Ben Hogan-style cap, has become known for a quirky swing, specially fitted equipment and bizarre analytical methods. He was caught on camera during the British Open having a meltdown at a Carnoustie driving range.

He was told at the Travelers Championship by PGA Tour officials that his use of a drawing compass was illegal. DeChambeau said that the device helped him figure out “true pin locations.”

DeChambeau finished in a tie for 51st place at the British Open. He won the Memorial Tournament in a playoff earlier this year for his second PGA Tour victory.