Siri is not only miffed by Scottish English, it also doesn't follow English spoken with a Japanese accent.
"Work" and "walk" are notoriously difficult for Japanese speakers — largely because the Japanese loan word for "work" is "waaku" (ワーク). Japanese people are used to saying "waaku" for "work".
The gentlemen who recorded this video has a good accent and more patience than I.
Siri vs Japanese, Walk? Work? F**ck?" [Watashi to Tokyo]