Keith Thripp was left with a dislocated ankle, broken leg and serious facial injuries after being set upon by up to 10 thugs.
The 46-year-old had told the gang that real Pompey fans would not misbehave as they shouted 'blue army' and kicked passi
ng taxis.
They then turned on him outside the Ship Anson Pub at The Hard, Portsmouth.
The dad-of-three, from Buckland, Portsmouth, said: 'If it happens again it could be someone's relative that suffers.
'We were waiting outside the pub for a taxi.
'There were a lot of guys running out into the road, kicking cars as they were passing and shouting blue army.
'All I said was, "You can't be Portsmouth Football Club supporters and go around damaging people's property. It's not about that any more".
'I turned around and walked back to the pub. From then on it is a blur.
'It is disgusting. You should be able to tell people not to act like that without this happening. Football violence is not what it used to be. It's frowned upon.'
Between six and 10 people launched the attack on Mr Thripp – kicking and punching him to the ground.
Anyone who tried to come to Mr Thripp's rescue was also set upon.
An off-duty paramedic repositioned Mr Thripp's ankle and he was taken to Queen Alexandra Hospital in Cosham by police after going into shock.
He underwent surgery to place a pin in his broken leg and repair a torn ligament.
Sales rep Mr Thripp said: 'I support Portsmouth Football Club. I have done since 1967. I do a lot of charity work for the Oakley Waterman Caravan Foundation in memory of former player Dave Waterman's son. I'm Portsmouth Football Club through and through.
'Football fans should support their team, support their neighbourhood. It's a family-orientated game. These people were not fans.'
A 24-year-old man from Portsea has been arrested on suspicion of causing grievous bodily harm and released on bail until June 27.
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