Remain campaigner Femi Oluwole has delivered a letter to Boris Johnson that said he rejected the new Prime Minister's "values", "Brexit" and "lies".
Along with other members of youth protest group Our Future Our Choice, he handed the letter to the Prime Minister’s team at the door of Number 10 Downing Street.
Mr Oluwole claimed Mr Johnson was “building a future that the young people of the United Kingdom do not want” in the letter.
It continued: “It will be our generation, and the least well off in our society, who are hammered by a no-deal Brexit - not your cabinet colleagues.
“It will be our generation who will struggle to get jobs during the Johnson recession that follows a no deal. It will be our generation who will have to spend the rest of our lives clearing up your mess.”
The letter was handed in to Number 10
Mr Oluwole said most young people voted to remain because they believe the challenges of the 21st century can only be faced “by working with other countries”.
He also attacked Mr Johnson personally, calling him a “serial liar”.
“Our generation doesn't want a leader who conspired to have a journalist violently assaulted, nor one who called black people 'piccanninnes' with 'watermelon smiles', Muslim women 'letterboxes', or gay men 'bumboys’,” he wrote in the letter.
“Never before has a Prime Minister been so divorced from the young people he leads. We reject your Brexit, your values, and your lies. And we are not going to roll over and let you destroy our futures.”
The letter follows a protest staged by OFOC last month, in which they put up a billboard in Boris Johnson's constituency likening him to the US president Donald Trump.
The billboard in Uxbridge depicts the leadership contender's face blended with Mr Trump's, along with the strapline "Make Britain Hate Again".