Britains may wear red socks. it's british. It's legal and appropriate.
But at others nationalities feet I do not so much like it. Mostly because every hipster around the corner wears ugly colorful socks now.
I trie to stick to blue, black, green (s.pict. my beloved N&L socks) or pink, sometimes even a light yellow/beige but red only rarely. But when weared, I really enjoy them. Ah, yes, cords help to feel a little less deplaced and a little more britain...
Enjoy your red Socks weekend.
PS: It's a pity France won the Rugby game:-(