'slightly' is a huge understatement. I have had several assistants who were French Muslims at school in the UK. One of them lived with us and her friends and family visited- the mum, about my age, was the only one who wore a scarf.
Their stories of the day to day racism they experienced from a very young age- were mind blowing. At school, then at Uni- and even more so with job hunting- and later flat hunting. They were all amazed how welcomed they were in UK, ho equal and respected they felt for the first time.
All those were well educated and as said, never wore any signs of their religion. Imagine what it is like for others. NO justification, NO excuse - but background can help see how it is a vicious circle.
Laicité or securality does not apply to all French- a very large portion of traditional conservative French people send their kids to all white Catholic schools, funded by the state. Partly for religious reasons- partly to have no contact with 'the others'. Nice is a hotbed for the Front National and later associated parties. And a large proportion of members are 3rd and more generation of Catholics from Spain, Italy, Portugal, etc.