Lando Norris booing, Rory McIlroy abuse and Ashes sledging: When sporting etiquette crosses the line

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?

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 towards the Englishman.

It was the second successive race that Norris has been booed by spectators, following on from the vitriol suffered at the Mexico GP.

Speaking after his win in Mexico, Norris said that being booed "makes it more entertaining for me".

"People can do what they want, honestly," Norris said in Mexico. "They have the right to do it if they want to do it. I think that's sport sometimes."

Yet he has also been open recently about how online criticism does impact him.

"I care a lot about people's perspectives and how I'm portrayed and things in the media.

"I probably cared too much - even at the beginning of the year, I think I cared too much, and probably it was affecting me in not the best ways."

The Ryder Cup is famed for its intensity, but this year at Bethpage Black, the atmosphere turned toxic. Rory McIlroy endured jeers, taunts from hostile supporters, while his wife, Erica Stoll, even had a beer thrown at her.

"I don't think we should ever accept that in golf," McIlroy said in Team Europe's winning Ryder Cup press conference in September. "I think golf should be held to a higher standard than what was seen out there this week. Golf teaches you etiquette. It teaches you how to respect people."

It wasn't only the spectators wading in with abuse. Even the Ryder Cup first-tee announcer encouraged expletive-filled chants at the Northern Irishman and stepped down from duties ahead of the final day's play.

McIlroy admitted the abuse "galvanised" Team Europe but he also called it "a tough week" that tested his mental resilience.