The Red Bull team principal, ­Christian Horner, has defended his driver Max Verstappen in the world champion’s increasingly ill-tempered feud with Mercedes’ George ­Russell and ­dismissed their very public falling-out as part of an end-of-year ­“pantomime season” before this weekend’s Abu Dhabi Grand Prix.

Verstappen has already been crowned drivers’ champion, a ­success overshadowed at this finale by the spat he is now embroiled in with Russell. Their ­altercation ramped up in Abu Dhabi when the British driver accused Verstappen of threatening to put him “on your fucking head in the wall” and that it was time someone stood up to the Dutchman’s bullying. Verstappen has denied making the threat.

Related: George Russell claims Max Verstappen threatened to ‘put my head in the wall’

Their falling-out began at the Qatar GP where Verstappen said the British driver had tried to “screw him over” in a stewards’ meeting to decide an on-track infringement between the pair and from which Verstappen was punished with a grid penalty.

The pair’s relationship has endured a series of flashpoints in the past but may have now irrevocably broken down. At the annual end-of-season drivers’ dinner on Thursday, ­Russell, apparently offered a seat next to him by Verstappen, chose instead to pointedly move the chair to sit next to his teammate Lewis Hamilton.

Horner defended Verstappen’s assessment of the stewards’ meeting in Qatar and his driver’s behaviour, although he did not address Russell’s claim Verstappen had threatened him.

“Max is a very straight-shooter. He tells the truth, exactly what he feels,” Horner said. “I believe 100% what he said to be accurate.

“A lot has been made of it yesterday. It is ­pantomime season, we are ­getting ready for Christmas, so maybe there is an ­element of end-of-term blues there.”

The FIA has been asked whether Russell’s claims will be investigated and whether, if found to be true, ­Verstappen will be considered to have brought the sport into disrepute.

On Thursday the Mercedes team principal, Toto Wolff, took the largely unprecedented step of joining Russell at his media call, where he described Horner – who had called Russell ­hysterical – as a “yapping little ­terrier, always something to say”.

Horner has a similarly fractious relationship with Wolff and chose to deliver his own put-down in reply. “Toto is quite dramatic as we all know. Toto likes to talk a lot but that is the way it is,” he said. “There is sort of a love-hate relationship where Toto loves to hate me.

“The great thing about terriers is that they are tremendously loyal. To be called a terrier, is that such a bad thing? They are not afraid of having a go at the bigger dogs. I’d rather be a terrier than a wolf maybe.”

On track in Abu Dhabi, when Formula One draws the curtain on its longest season, it does so with at least a sense of occasion. The meeting will not only decide the constructors’ championship, a moment of no little import to the protagonists, McLaren and Ferrari, but will also mark the end of an era as Hamilton bids farewell to the Mercedes team with whom he has enjoyed unparalleled success.

For McLaren, who are in the driving seat, leading Ferrari by 21 points with 44 on the table to be won and with Ferrari’s Charles Leclerc ­taking a 10-place grid penalty for fitting a new battery, it represents a potential redemption that seemed unimaginable a few years ago.

With Lando Norris and Oscar Piastri quickest in second ­practice, McLaren very much hold the whip hand at the Yas Marina circuit. They have not won a constructors’ title since 1998 1998 when Mika Häkkinen and David Coulthard sealed it, the longest period any team has gone between constructors titles. Bring it home in Abu Dhabi and it would r­epresent a remarkable turnaround from the nadir of the mid-2010s when they finished ninth twice. To do so, among the various permutations the simplest is that a win for either Norris or Piastri would do the job, as would either driver ­finishing in front of both Ferraris.

Hamilton, as a former McLaren driver, will doubtless take pleasure in the team where he began his career finally landing some silverware since he last did so with the drivers’ title in 2008. Yet he would take heart from a Ferrari victory given he will be joining the Scuderia next season. For now, what he said would be an emotional weekend will mark his swansong with Mercedes.

They have enjoyed a remarkable partnership that has elevated the British driver into the pantheon of the sport. Six of his seven titles have come with Mercedes, with 84 wins, 153 podiums and 78 pole positions from 245 races, while together they have sealed eight constructors’ titles. They are numbers that almost defy belief and have helped redraw the landscape of the sport. Michael Schumacher’s records were felt to be untouchable, yet ­Hamilton has surpassed them in the longest and most successful ­partnership in F1 across 12 seasons.