If you are annoyed and angry at the movie that you are watching, let me remind you certain things about American movies. You should be aware that those entertainment is meant for 'just below the average'. If the average American can spell 'coffee' then they joke with 'kophie'. If the average American can calculate 15 x 3, they joke with 5 x 5. If the average American know what the voting right is, they joke with changing the constitution by the dictator.
The audience who can spell 'psychology' simply are not there. Not in their movies, not in their songs. But they exist and they are the ones who does the job. What's worse, those who can calculate integral cannot represent themselves there. But they exist in smaller numbers even in the States. They are invisible.
So, what they amuse themselves is just below the average. In such nations in which the average means at the very least can draw a map of their own nation and provinces. But what is the average audience in the States?
What is considered 'funny' in the States is just as gross as French meanness.
The excessive American friendliness thinking "you're the same" principle is just the same as claiming that black and white are the same.