"The annoying part has been the attitude of almost all occasions I've basically felt that arrogance of "YOU ARE NOTHING, WHY THE HELL SHOULD I LET YOU IN, you pitiful European".
Seconded (or thirded, fourth'd, whatever, didn't bother to read the other replys).
What really killed me was my last entry, when the DHS officer spoke worse english than I do (a feat quite hard to accomplish). The whole process feels almost designed to put you off visiting the USA. I mean, they had these sort of motivational posters everywhere, telling the DHS-personnell that they were something like "the calling card of America" (paraphrased) since they would be the first contact any visitor has with the USA. The general feeling of annoyance and unpleasentness, however, was so deep and felt so institutionalized, that I've come to believe it's being done on purpose, and the posters are some kind of cynical joke.