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Katie Price has blasted a “cruel” online troll over a derogatory and offensive meme circulating on social media about her eldest son Harvey.

The mum-of-five, 43, shared a screenshot of the post from @bossman_memes with her 2.6 million followers on her Instagram Stories, and expressed her disgust at the crude joke.

“Wow @bossman_memes this really is below the belt and cruel. Imagine if this was done on your child,” Katie wrote.

The model and author shares Harvey with former footballer Dwight Yorke, and she’s openly documented the struggles her eldest child faces.

Katie fumed over the vile sex joke meme featuring Harvey
(Image: katieprice/Instagram)

He was diagnosed with rare genetic disorder septo-optic dysplasia when he was a child, which is a condition that affects eyesight, and also has Prader-Willi syndrome, as well as autism.

The cruel meme comes just one day after a man who shared a blackface video mocking her disabled son on Twitter was cleared of sending it with the intention to offend.

He was arrested in November last year after allegedly posting the video on social media, and told Sussex Police officers he had been sent the clip via WhatsApp.

Lewer, 52, was detained on suspicion of sending an offensive, indecent, obscene or menacing message by a public communication network, but on Friday, he was found not guilty.

Katie has vowed to continue fighting online abuse of her eldest son

The court was told he shared the clip as a joke and did not mean to cause offence.

Katie expressed her disappointment at the verdict in a statement, and said despite the setback, she won’t stop fighting for justice against online trolls.

"The government needs to take urgent action to stop these faceless keyboard warriors from emotionally harming innocent and vulnerable people from the safety and comfort of their own home,” she fired.

“Today's outcome was indeed a blow and only drives me onwards to fight for what is right – for justice."

Katie wants parliament to pass Harvey's Law, which would strip trolls of their online anonymity

She also documented the complex needs of her son in BBC documentary Katie Price : Harvey and Me earlier this year, which followed her as she searched for a specialist college that would be able to accommodate the 19-year-old.

Katie said she was forced to look for a residential college, where Harvey would stay as a full-time student even on weekends, after his distressed outbursts became increasingly violent at home.

He would become triggered by loud noises, and he would lash out by punching walls or hitting his head.

"I was at crisis point. It was affecting the other kids, it was the danger-zone for him, smashing the house up. I hated him going to residential. I cried. But I saw he was happy there,” she told the BBC.