Heh, haven't heard of this but as a frenchie who sometimes hears swedes over the internet, I find that the permanent snus makes it sound like the person can't stop keeping some gum in their mouth, refilling mid-sentence because they really, really can't help it and it's more important than your interaction.
And so, having grown up hearing "audible gum chewing is rude", that sometimes feels rude to me. And it's not even in person!
Zyn pouches are designed to be placed between the user's upper lip and gum, or between the gum and cheek, and used for up to one hour. If someone is swapping out in five minutes then they are literally wasting product, even if you chewed it for five minutes I don't think you could process it all. Based on my experience in using the product for a couple of months.