I want to explain about me referring to a member as "a delightful nut case". In England, this is a term of endearment! English people love the "eccentrics", the slightly "loopy" characters. Watch any TV show or movie with John Cleese.Even in the USA there are many examples of "delightful nut cases". Laurel & Hardy,Abbot & Costello,W.C.Fields, the Marx Brothers; and many others.
The "delightful nut cases" are, indeed, delightful! Referring to a person as "a delightful nut case", far from being rude,is a compliment!