"We haven’t got a monopoly on idiots," he said. "Some people say some daft comments but we immediately expel them."
Singh also defended party members who jeered a journalist who asked why there was only one black face in the party's manifesto at the document's launch.
"Everyone is twisting it," he said. "If you had a lot of ethnic and black candidates in the manifesto then it would be overkill. It’s not an issue any more. That’s so boring."
In a recent leaflet, Singh described UKIP as being like a chocolate bar: "We are like a chocolate bar. You have the wafer bit, the caramel bit, and the chocolate bit. It's a mix of all these different things, and it tastes really good."
He told BuzzFeed News that the EU is the "biggest racist organisation in the world because they won’t let African countries bring stuff into Europe".
Singh said that everyone who wants to come into the UK should have to have a medical, and if they have HIV or another illness, they should have enough funds or travel insurance to cover it. He added that nurses tell him "the health system is full of migrants and health tourists".