Sometimes, children can be cruel, but the worst thing is when those children never grow up and continue with their bullying and cruelty... I wasn't the shortest in my class, but I was 3rd from behind, so I was spared mockery regarding that...
On the other side, I was mocked for not being the same nationality as almost everyone else... I was thinking it has something with the place where you live, the country, or the small towns/villages, but it's the same everywhere in the world... Somewhere a bit more tolerance, somewhere less, somewhere pretended, etc.
And one more thing... Speaking of karma, I never wanted something bad to happen to anybody, but the karma did its job and hit hard some of the people who were bullying others... Usually with consequences for the rest of their lives...
Children are cruel and find any reason to make fun of others, especially when they are formed into a group. That's when the individual most often gets hurt. The reason can be any. In your case, nationality, but also skin color, some illness, wearing glasses, wearing braces, if someone is too tall, if someone is too short, if they are too thin or maybe too fat. Children make fun of even those children who are the best in terms of success in school and rarely the worst...
And all this can be tolerated, until some years, when the child's brain should start to differentiate between good and bad.
So whoever continues to mistreat others, and karma catches up with him, is not to be pitied.
Thanks for the support! 🙏