Xenophobia on the bus

I am a daily user of the Gautrain. The Gautrain staff are always friendly and very helpful, however, on Wednesday morning (04 September 2019 at 08h20) I was appalled by the behavior of the Gautrain bus driver. I take the S5 Gautrain bus from the Gautrain Sandton Station to Monte Casino, on this particular Wednesday morning, while en route, a taxi driver had disobeyed the rules of the road and frustrated the Gautrain bus driver when approaching a traffic light. At the traffic light, the Gautrain bus driver then proceeded to open his window and shout at the taxi driver. It was what the Gautrain bus driver said to the taxi driver that I find completely inexcusable. The Gautrain bus driver told the taxi driver,"...you don't know the rules of the road because you are not from this country. Go back to your country!". This sort of behavior is unacceptable.