School need to sort this out ASAP! Hopefully, they can do something with the entire class. Because if someone is allowed to say this stuff unchecked then you can guarantee there won't be only one child saying upsetting or racist stuff.
My primary school experience:
I was about 8 years old when I repeated something racist along the lines of the bread comment that I picked up from school.
My father (who was a teacher) was completely disappointed in me, I got a telling off and he then spent a great deal of time explaining why you can not say stuff like this, and also that he expected better of me, and how would you feel if someone reduced you to such terms.
This was a long time ago now, but he also used to point out everyday racism and sexism, such as the Williams sisters in tennis - when people used to say they were too muscly, or too masculine - or where some of the advertising had racist overtones (I remember him pointing out an advert about a chain of restaurants that was seriously dodgy and he pointed it out), and also the history of the country I grew up in (not UK).
Bless him, he also told me I had to step up and be friends with an immigrant student who joined my class at the beginning of secondary, as he explained that I needed to help this family settle, and if I was kind to her and friendly, then other children would be (again along the lines of imagining coming to a new class, new school and new country and how you would have wanted someone to make an effort for you).
My own child has also had negative comments about being a supposed immigrant (he was born in the UK but I am an immigrant) at primary school. The school was hopeless, and didn't really want to follow up on it so in the end I just tried to build up his confidence and told him the story of my Dad. My child says the day he was teased was the worst thing about primary school. He got very upset over it at first.
Not really sure if the above helps or not?