I give my girlfriend ( a London native) grief for her spelling, and language, all the time. Of course, having spent much of my youth overseas under the tutelage of European teachers, I had to unlearn a lot of stuff upon returning to America -- the extraneous "u", "s" instead of "z" ("criticise" vs "criticize"), and so on.
I still cross my "7"s, though.
I still cross my "7"s, though.