US president criticises treating women as second-class citizens in rousing address in Kenyan capital that also offers insight into his African heritageBarack Obama offered a poignant glimpse into his African heritage and went on the offensive against female genital mutilation and other “bad traditions” that treat women as second-class citizens, in a speech in Nairobi.The US president addressed 5,000 Kenyans in the country’s capital on Sunday, in the centrepiece event of his first visit to his father’s homeland since he was elected.