Michael Johnson hits out at 'dumb*ssery' accusations of 'black racism' levelled at him after he questioned world record

Track legend Michael Johnson has slammed 'dumbassery' accusations of 'black racism' directed at him after he raised questions about the legitimacy of Nigerian sprinter Tobi Amusan's world record. 

The 100-meter hurdler romped to victory in 12.12 seconds to beat Kendra Harrison's 2016 world record by 0.08 seconds at the World Athletics Championships in Oregon Sunday. 

Johnson took exception to the times recorded in the stadium, in which 12 athletes of 24 in the semi-finals recorded their best ever times.