Talking of Zenophobic tribal tendencies
It turns out that the OED does indeed list "zenophobic" as a variant of "xenophobic", which is a shame as I'd much rather it were reserved for a sense which isn't listed: "an irrational dislike of Zeno's paradox" -- that is, a dislike for travelling between two points without passing through all the points in-between. It's no surprise that this meaning isn't listed, as I made it up myself, but it surely deserves to be a word, because I can't come up with a better name for the reason that I prefer cycling or walking to cars or trains, and the reason that, if I do ever get a car, it's got to be a convertible.

Peter