Police said footage and photographs of the incident in Portsmouth had later been posted on various websites and on YouTube.
Officers had cordoned off part of a road after the man, who was drinking from a can of lager, was seen clambering over shop roofs on Tuesday morning.
He eventually stopped on the bridal shop roof and a 100-strong crowd gathered in the street below.
Witness Timothy Braithwaite said he was horrified at the ghoulish behaviour of those taking videos.
‘There was a woman with kids filming it, I don’t understand how you can be there with kids in the first place, never mind filming it. It’s disgusting,’ he said.
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The injured man’s parents, who said the incident was ‘completely out of character’, condemned the actions of those involved.
In a statement, they said: ‘He is a vulnerable man who has had to deal with some significant challenges in his life and when he clearly needed compassion and understanding was met with cruel taunts and encouragement to end his life. Despite this, he is hanging on in hospital and we are hoping he will recover. If he does, he will have a long journey ahead.
‘The behaviour of those at the scene on Tuesday shows a lack of understanding for people like our son and what they may be going through.’
A woman in a nearby office described hearing people encouraging the man to kill himself.
Patrol car: Hampshire Police were trying to talk the man down from the top of the building while some members of the public shouted at him to jump
‘There were some people shouting at the man to jump – one man who shouted was angry because he couldn’t get to the Job Centre as it was within the cordoned off area,’ she said.
‘I also saw three people filming what was going on and others were taking photographs too.
‘Taking a video is definitely crossing the line. And it’s even worse that they then posted the videos on the internet – I just don’t understand it.’
'He is a vulnerable man who has had to deal with some significant challenges in his life and when he clearly needed compassion and understanding was met with cruel taunts and encouragement to end his life'
Injured man's parents
The woman also described the moment the man, who is from Portsmouth, jumped off the roof.
‘Everyone in the street gasped when he jumped. The sound was horrendous; it was a combination of a loud thump, a crumple and a bang.
‘As we are on the second floor of the building, I actually saw him fly past our window while I was looking out.’
Hampshire Constabulary said it had contacted internet sites which had posted the images and asked for the footage to be removed.
A spokesman added: ‘This was a disgusting display by members of the public. It was undignified and callous.
‘It showed a complete lack of empathy for the person involved and for officers trying to deal with a very sensitive situation under immense pressure.’
The man was at Southampton General Hospital with his family at his side last night.
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