I think it might be a porn and cultural thing.
I think Americans are thicker skinned when it comes to constructive criticism. We have 250 years of capitalism. It's make it or break it in America. Culturally we know it pays to listen to what others think. You need every advantage you can get in a dog eat dog world.
Eastern Europe has only been capitalistic for 35 years. Old cultural ways of I'm the boss so there for I'm the smartest person in the room don't just go away over night just because a government changes.
To be in the porn business, you probably need to have a high value of yourself to begin with. Narcissism I'm sure runs high in this field of work. Narcissist think very highly of themselves and really don't like being told they are wrong about anything. These kind of people are hard to get along with. They usually just keep a circle of yes men but they aren't true friends.