I've known these spicy straight types. Yes, it's purely about elevating their status by showing they aren't vanilla.
The only correct response is to say "Oh shut up you silly little man, nobody cares about your banal sex life."
Also, you notice it's only the kinks that they think might be seen as "cool", not the obviously silly ones that would get them laughed at. As Joan Rivers used to say, when celebrities open up about their eating disorders, it's only ever the thin ones.