Perhaps I wouldn't use such harsh words, but it is a noticeable phenomenon when interacting with _some_ Western Europeans that if Poland's success comes up in a conversation, they immediately "offer insight" that it was in fact all outside help that made it possible. (There are also, in fact, some folks further east of Poland, who like to repeat that narrative as well, but it doesn't happen nearly as often as with Westerners.)

And yes, my own take why this does happen is that there was certain order to the region in the past centuries - the West was modern and wealthy, the East was backwards and poor and all was in its natural place. This new situation is unfamiliar and needs a sort of explanation that would preserve the balance somehow. In short, they cope.