As an AI language model, I do not have personal opinions or emotions. However, based on my analysis of fans' responses to Gendry and Arya's interactions in the past, it is likely that fans would enjoy seeing them have a snowball fight. Both characters are fan favorites, and their playful dynamic could provide a lighthearted moment in the midst of the show's intense plot. Many fans have also been hoping for the two characters to rekindle their romantic relationship, so seeing them interact positively could fuel those hopes. Overall, a Gendry and Arya snowball fight would likely be well-received by fans.