> Are you sure this isn't impression you've gotten from isolated reactions involving a small number of individuals, perhaps just a single individual?
Swedish here. The impression is common. Sweden is a small country and has long had a fairly cohesive culture. The culture has decided that digital payments are the way. Deviation from the collective way is always suspect.
Your impression is misguided. Maybe it's the norm in Stockholm, but 80% of the population live elsewhere. We do use cash and nobody thinks its suspicious to pay with cash, stop making stuff up.
