Morgan said anyone complaining was "part of the problem".
Diversity's powerful performance is now the second-most complained about TV moment in a decade. I'm right in the centre of it.
The stand-in judge said the dance group stood by "every decision" made in the performance.
Ofcom is now weighing up whether to launch an investigation into the performance.
"George Floyd was a black man in America who died when a white police officer put his knee on his neck for nearly nine minutes. a moment that horrified the world".
He also explained the strong performance and what it represented, saying, "The performance was a brief roundup of an extraordinary year, anything from lockdown, to COVID, to stunning NHS, to the spotlight on racism - it all happened with George Floyd in America".
In a video posted to Instagram on Sunday he said: "It's been a insane week and I've kind of been a bit quiet on social (media), I've been living life trying not to get caught up in it all".
"Frankly, it's overwhelming, the positive reaction to what we did, hundreds of thousands of letters, comments, direct messages and interactions on the street".
In a seven minute clip posted to Instagram, Banjo said though the majority of the feedback he'd had was positive, he had also received negativity, including threats and racial abuse.
"I'm not going to give it anymore time than it deserves". "I knew it before and I definitely know it now", said the presenter.
"Racism is very real", he added.
He said he "just can't get on board" with the argument that BGT was the wrong platform for their message.
The operation brought criticism and praise from members of the public, together with the amount of complaints on broadcasting watchdog Ofcom climbing to 15,500 because the episode has been broadcast. "If an artist and a creative can't use real-world human issues - like universal issues - to inspire their art and to come through in how they express, then what's the point?" he said.
"A lot of people were offended at the political nature of that statement, but that's never what we intended. Black Lives Matter, long before it was anything political, was a statement".