From Lewis Carroll’s Symbolic Logic (1896):
POSIT: IF you are a famous children’s author AND you are British THEN you are an antisemite.
(cf. Roald Dahl, J.K. Rowling, this asshat, probably Rudyard Kipling, etc.)
As an aside, the fact that Carroll (who came from a family of high-church Anglicans and took holy orders) wrote #21 tends to give credence to #20: All W.A.S.Ps are unfriendly.