The parent is almost certainly referring to the distinction between:
(-> (initial) a b c d e)
and
(e (d (c (b (a (initial))))))
I find -> and ->> useful, but the new threading operators kind of silly; they're very easy to implement in terms of -> and ->>, or in terms of higher-order functions, and don't really cover all the use cases one would want---it offends my sense of aesthetics to have them (in their particular implementation) added to the core ns.
(-> (initial) a b c d e) is like "The city on the bay in California"
and
(e (d (c (b (a (initial)))))) is like "The Californian bay's city".
These variations are different thematic structures to language.
In my view it's exactly the opposite:
(-> (california) bay-in city-on) ; "The Californian bay's city"
(city-on (bay-in (california))) ; "The city on the bay in California"
If you're referring to the distinction between -> and ->>, it's not about direction preference, but rather that functions that conceptually work on a single subject (e.g., conj, assoc) typically take that subject as its first arg, whereas functions that work on a sequence subject (e.g., map, filter) typically take that subject as its last arg. From that consistency emerges the two different threading macros.