That is simply not true! Most of the popular pocket 380 pistols today are just like the 9mm are not blowback, but rather are locked beach actions and if you try shooting a 9mm in the same size and weight as the popular pocket 380 pistols you are going to feel a lot more recoil from the 9mm.Around here people will warn you ahead of time, .380 is rarely more manageable than 9mm in a small gun. The action type for .380 is typically a blowback while 9mm's use a delayed blowback action. This leads the .380 to feel sharper and, yes, unpleasant.
However, Sigs P238 is a very soft shooting .380.
I agree that the P238 has by far the least felt recoil of all the pocket 380 pistols.