“Certain dialects of Dutch are mutually intelligible with certain dialects of German. Therefore, there is no such thing as Dutch or German, and no such thing as dialects thereof.” Or again: “The English word ‘theatre’ is pronounced differently in various dialects of English. Therefore, there is no such thing as English, dialects of English, or the word ‘theatre’.”
Homework: In what sense is this sloppy? Can it be made non-paradoxical?