It's not exactly due to cultural differences ter Stegen didn't celebrate. He was the first in line to hug Bravo when we won the Liga (
X) so it's not about him above the team, nearly took out Dani running away from Pique's champagne shower and was singing in the locker room with the rest (
X)(
X). Acted similarly enthusiastic when we won CdR and CL. His behaviour at CWC
was out of character for him alright. What isn't clear though is whether we are putting too much importance to it. Maybe he just had an off day, maybe he was upset at the time but shook it off by the time FCB landed in Spain or maybe ... the point is we can't know. So it's aimless to keep going back to CWC and IF turns out to be any significance at all, we'll only hear about it after the Christmas break when the players get back, and not a day sooner.
This is a stalemate situation, all that it does right now is make cules come up with more over-the-top reactions.