Renowned economist David Ndii has defended a boy from the Consolata School in Nairobi caught on camera spewing adult-rated slurs and threatening to eliminate a female school mate.

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In a video which went viral last week, the 13-year-old class seven pupil insults his colleague and threatens to kill her for allegedly claiming he is gay.

However, according to Ndii, Kenyans should stop criticising the boy since what he did was not 'abnormal' and had been done by his age mates even in the past.

In a tweet on Monday, the Harvard University graduate admitted smoking bhang and drinking illicit brews together with his colleagues when they were in high school.

He noted they engaged in the activities and other 'profanities you cannot believe' and they succeeded in their academics such as literature where they studied a book by veteran Kenyan author David G Mailu.

"What is the big deal about a 13 year old mouthing profanities. At 13 we were in Form 2, smoking pot, drinking chang’aa, singing circumcision songs, devouring Mailu and speaking profanities you cannot believe. Wacheni ujinga (Stop being stupid)," Ndii tweeted.

He was reacting to an opinion piece on the Star by social commentator Susan Mugwe who said it was not right for the pupil to take to social media to insult the girl who allegedly referred to him as a gay.

"Finally, my unsolicited advice to the Consolata student is this: Some fires are not put out by pouring water on them, but by sucking the oxygen out of the room very slowly, but deliberately. Eventually, they die out."

"So the next time anyone labels you negatively, do not react. It only fuels them. Simply walk away, with your head held high, and with some swagger too, because acting to the contrary, makes you a victim. And victim hood is the currency bullies love to cash in on," Mugwe wrote.