"Hate" toward Americans comes from frustration. There are two obvious reasons of it. First: Educated Poles who come here due to the language problem usually are employed way below their abilities and consequently after the initial period not very happy. They observe their coworkers and observe the level of knowledge far lower than their own and form opinion based on that. The other is a quality and type of US education. Quality is low and schools regardless on level resemble trade schools, consequently society become anti intellectual.
Second: Value system based on money. While very rational in the capitalistic society the expected result is that friendships are eliminated. What Americans called friend is more like business associate, parties are organized for networking. Any type of association has underlying business part in it (sports may be excluded).
Not related to the above, from my very cursory observation Americans are very hard working people, they work harder, longer hours (and years) than any other in the world. As a consequence they accumulate more things than others, but it takes toll on their intellect. Combining it with the level of popular entertainment (this comes to Poland as well) and no wonder that they seem to be intellectually challenged. Consequently Americans are easy target for advertisements and results of their hard work are being wasted.
Pavo:
It's sad that many Americans can't seem to manage that in a lifetime.
I hope you will not waste your life. Do not get entangled in an American dream. Hard work, while sometimes a necessity (your parents) is harmful and beyond some point makes little sense. Read a book, throw away TV, go for a walk, do nothing you would be surprised how enriching it is. $4 million of your parents should allow you security and option of not taking part in the rat race.