The same thing happened to me in a UK school in the 1980s.

I was told off repeatedly - and my parents told - about my poor handwriting, my tendency to "rush" work, and even that I went to the toilet too often. Of course, the reality was that I was bored and the teacher was a vindictive fool.

I remember saying to my mum at 8: "I'm worried about my 's'es", and she said "it's hardly likely you'll be sacked from a job because of your 's'es is it?".