Spell checkers

Why does Kmail's own spell checker not recognise its own name? Why doesn't it recognise offensive when it knows inoffensive?

(Click image for full view.)

The second screen capture wasn't taken by me, it came from a Macintosh, so I can't entirely vouch that this is genuine. But it looks real:


Suggesting "Windows" as a replacement for Linux surely has to be a joke by Apple's developers.