Religion
In reply to the discussion: Muslim women defy ban to swim in burkinis at French pool 24 June 2019 [View all]AtheistCrusader
(33,982 posts)and expect it to behave so. (Likely why the pools are now closed, as I suspect the French either do directly as well, or are observing UN rules. Like Mardi Gras, a ski slope is contextually appropriate, and if someone demands to see your face (like a police officer, which would be legal (Terry Stop)) you wouldn't have an affirmative defence of 'sorry man, it's mardi gras, so no'. Where a religious exemption is a bigger deal.
And as I mentioned, the face covering is not at issue at the pools. Nor is French law. (They should be free to wear those burkini's.)
In public spaces, when people conceal their faces, it engenders suspicion. Another social enforcement thing. Much like someone open carrying a firearm. It's unusual. It's out of place. Many will interpret it as a security issue.