In the video, Joshua is heard to be said: “Show them where it hurts.
“Abstain from spending your money in their shops and economies, and invest in black-owned businesses.”
The video quickly went viral and led to Joshua receiving accusations of being a racist on social media, which prompted a stern response on Sunday night to tell them to “go f*** themselves”.
In a statement posted on Twitter, Joshua said: “If you think I'm a racist, go f*** yourself!
“If you watch the full video, the speech was passed around for someone to read and I took the lead.
“I personally spoke from the heart about the Watford community, ideas of us personally investing seven figures to create unity and opportunities and adding change to the African/Caribbean community.
“Shops aren't the issue here. Before you talk s***, you better boycott racism.”