Foreign Customs
On the one hand, there is considerable evidence of intercultural exchange between the Scythians and their assorted neighbors (e.g., evidence of Achaemenid Persian materials/objects in Altai burials).
On the other hand, there are accounts from Herodotus (Histories 4.76-78) wherein he describes noteworthy Pontic Scythians–Anacharsis and Skyles–who were murdered by their fellow Scythians for having participated in non-Scythian religious rites or adopted non-Scythian customs/practices.
It’s possible that the xenophobic take on foreign customs described by Herodotus reflects solely the Pontic-area Scythians and not other steppes groups. It’s also possible that these stories were used to explain why or how the Scythians were not more present in Greek life or culture (or, perhaps to embellish their barbarity).