“He makes no mention of it being assur”
complex problem whether or not it is assur (in the narrow sense)
it is certainly a goyish custom
the problem is, since so many of us Yidden have become estranged from our roots, from our fathers, from Yiddishkeit, from Hashem, and even though some observe technical Halachah, we have adopted many customs and mannerisms from our goyish environment.
do those customs become somehow then absorbed into the lowly world of Yiddishkeit today, as it is practiced by so many?
or do the embers of Har Sinai, still alive in every Yid, holy, pure and untainted by the Nations, define what is a Yiddish way of behavior?
for the Holy Poskim to determine.