[dudul]

France is only perceived as "racist" because historically it tried to enforce a very assimilationist model of immigration. Where countries like the US or the UK are perfectly fine with communities living next to each other with their own specificities, in France everyone is French. If you move to France it's not to import your own way of life, it's because you want to adopt the French one.

The model is simply due to how the country was created (a cosmopolitan group of very different cultures that had to find a way to form a unified country), but I don't know how sustainable it is in our modern days.