Back in the day, it wasn’t cool to be African in the UK. Being African would get you clowned from teachers making fun of your name, to Caribbeans clowning you. So with that, a lot of Africans internalised self-hate & wanted to be anything but African. That’s probably the “c00n” reference.
But Skepta was the first to shake it off in UK’s entertainment industry by screaming his name “Joseph Jr. Adenuga”, “I’m Nigerian, not from St. Lucia”, & “Big bad Nigerian” in his lyrics. I guess that’s what he’s alluding to.