The son of Fulham owner Shahid Khan told a supporter to 'Go to hell' and insisted he will 'die at this club' after being told to leave.
The Premier League strugglers suffered a 14th loss of the season of on Saturday, surrendering a second minute lead in defeat at Burnley to leave them five points adrift of safety.
And with tensions rising within the fanbase, vice-chairman Tony Khan reacted angrily on Twitter after trying to ease fears of relegation back to the Championship on Twitter.
Having promised not to surrender and claimed there will be 'multiple signings' this month, one fan replied: 'Leave my club please'.
Khan, also the co-owner of NFL franchise Jacksonville Jaguars, wrote back: 'Never. I’ll die at this club. Go to hell.'
The 36-year-old had initially tweeted: 'Thank you to all @FulhamFC supporters, especially those at Turf Moor today.
'To squad, staff + supporters, some people are waving the white flag and saying we should surrender, people said the same when we were 6 & 4 points behind the past 2 seasons; we closed the gap both times.
'Our squad has great moments, but they’ve shown their abilities more often than they’ve gotten the points we need. But we can close this gap.
'As with last January we’ll make multiple signings to improve the squad, but it’s on our players now to fight, finish & win. Come on Fulham!'
Claudio Ranieri's side had taken an early lead through Andre Schurrle but contrived to lose at Turf Moor without conceding a single shot on target.
Own goals from Joe Bryan and Denis Odoi led Burnley to a third successive league win to ease their own relegation fears.
