Sport thrives on emotion. Rivalries, chants, celebrations are all part of its heartbeat. But recent flashpoints across different sports have raised a pressing question: when does passion become hostility - and what effect does it have on our sportsmen and sportswomen?

From fans' abuse of Rory McIlroy at the Ryder Cup, to the Aussie media's sledging of Ben Stokes and England's cricketers upon their arrival Down Under for the Ashes, where should a line be drawn?

Racing Bulls team member incites Lando booing

In Sao Paulo, McLaren's Lando Norris should have been basking in glory after stretching his lead at the top of the drivers' championship with another victory.

Instead, a Racing Bulls team member was filmed giving a thumbs-down during the podium ceremony, appearing to encourage boos to

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