My children are mixed heritage.
So far in primary we have had one child not being allowed outside to play due to not wearing sunscreen and a hat at the first sign of spring sunshine. All my children have vitamin D deficiency, which is being treated and this blanket policy which failed to take into account the needs of people with darker skin shades for sun exposure for their health did not go down well with us. The local education authority were involved after the school repeatedly kept my child inside even after we spoke to them. They agreed the blanket policy was discriminatory.
Recently we had children with darker skin shades being targeted in the school by other pupils due to Covid, which the school to be fair did clamp down on quickly.
Youngest had support from his school after a student made a racist comment to another child who is black, but he also was impacted emotionally. His school dealt with this well.
We have had issues with not pronouncing names correctly at first, but most regular teachers learn them correctly quite quickly.
Lndnmummy I have also seen this discrimination of children who are black, mixed heritage or Asian with special needs. There is a long history of this within education (the recent Small Axe series on the BBC had a film that covered this). Often diagnosis is delayed as the school look to blame families for the child's behaviour whilst completely failing in their duty to support the child who has obvious needs. It is not your fault, my youngest has ASD and I have friends who have children with ADHD who have been treated this way, so I completely get it. It also happens less frequently to white families too, particularly the poorer families where class prejudice operates towards them.
I think that there might be some times when hair needs to be tied back for safety reasons if possible, such as using a Bunsen burner in Science. I have seen Bunsen burner incidents just caused by carelessness or mistakes and looked after children with burns and wouldn't wish this for any child.
None of my kids has had issues yet with hair policies. Dd1's school says no outlandish styles, but braids and afros are permitted, her school is not particularly multi-cultural and the leadership are all white (we are not in London or another major city). Hijabs or turbans are meant to be school colours in all their schools which was something mentioned in the Pimlico Academy protest.