But it does seem like Seungmin gets this treatment way more than the others.
Sometimes it's clear that he wants more of it (like in the above-linked clip), other times he might put up a brief struggle but quickly gives in, most of the time he calmly & cheerfully accepts it.
I have two theories:
1. He perceives it as simple affection & enjoys it in a platonic way.
2. He's subby af and being manhandled, pinned down, carried over someone's shoulder etc is his happy place.