Sorry if that’s a controversial stance these days.
If you are not saying this, then it's unclear how this is related to your previous comment.
You could write a comment that makes sense by saying "Afrikaners usually believed in weird corporal punishments because that was normal in their culture" or something and that would be perfectly acceptable.
Or perhaps, you have some specific knowledge that this guy was actually a proponent of apartheid, which you should share.
Anyway. In the early 90’s, in the U.K.? They were coming over for one reason only. The Afrikaner masters were always racist, always fans of collective punishment and bizarre corporal punishments.
We tended to hear a lot about black-white relations in South Africa, and even fighting between different black African groups... But much less so about the split among whites. I'm told by white South African English speakers that certain Afrikaans speakers were very resentful of them. Some of them didn't like the rugby and cricket boycotts of the 1970s and 1980s either.
It is perfectly possible that some of what you experienced from that teacher came from all this.
I do not agree with this statement though "They were coming over for one reason only." Many South Africans came to the UK for economic reasons, or cultural ties much like Aussie and Kiwis. I had a white South African drama teacher at school and while I could criticise many of my other teachers, I always found him to be pretty easy going. Except in one area. Some of the children used to make fun of his accent and he didn't like that, which I can understand. He came over years before apartheid was dismantled by the way, but never gave any indication of supporting it.