Former Royal butler Paul Burrell said Prince Charles made a "silly" mistake following his attack on the media during his skiing holiday.
The prince was recorded quietly muttering "bloody people" and calling a BBC reporter "awful" at a photo-call on the slopes in Klosters in Switzerland.
Mr Burrell gave his reaction during a visit to a Wrexham hospice on Friday.
He was handing over £136,000 to Nightingale House which he raised by taking part in a reality TV show.
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I think it's very strange that a man who's been brought up in a professional way surrounded by the media should make such a silly mistake
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Paul Burrell, the former butler of Diana, Princess of Wales, lives on the outskirts of Wrexham and runs a florist shop in Holt.
He told reporters that Prince Charles' outburst at the media was "strange".
"I think it's very strange that a man who's been brought up in a professional way surrounded by the media should make such a silly mistake," he said.
"Perhaps he was frustrated being bombarded by so many questions at one time," he added.
Mr Burrell has had a long association with Nightingale House Hospice which cares for people with life threatening illnesses.
The charity needs to raise £1.65m every year to keep operating.
The money will help fund patient care at the hospice
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Mr Burrell spent 16 days in the Australian jungle with the TV show I'm A Celebrity.....Get Me out Of Here.
The money he raised depended on the number of votes he received in coming second to comic Joe Pasquale.
During his time in the jungle the Princess of Wales' former butler had to eat a stomach-churning menu including worms, beetle larvae, cockroaches, cheese fruit - or "vomit fruit" - and kangaroo testicles.
"I was always hungry but there are worst things in life to suffer," said Mr Burrell.
"Whilst I was in the jungle I did think about the people here [in the hospice] because I did come and visit before I went and they sent me on my way.
"I did think that some of those people might not be here when I got back so that did spur me on in my quiet moments in between grubs and kangaroo testicles.
"I've got two good friends out of the jungle, Joe Pasquale and Fran Cosgrove. They are my friends and I can rely on them," he added.
Jo Young, a fundraiser at Nightingale House, said staff and patients were delighted with the money raised by Mr Burrell, a patron of the charity for six years.
"The patients had been wanting to see him for ages and wanted to say thank you for what he has done for us," she said.