Reason being American spellings.
I didn't like to tell the genius she could simply change the language. I also said I use the best of both worlds. Doing it in my head and using the spell checker. This was an interview situation where I had to take a typing test and the time limit was sharp.
It's really helpful having spelling mistakes highlighted in red. Make the system work for you, not the other way around.
Life is what you make it.