How can I be less bitter?

I came to Spain 5 years ago to learn the language. I arrived w/ a positive attitude but in that time, I've learned to hate them. In addition to them being rude, there's this mandatory conversation you have to go through every time you meet one: Bush sucks, Americans are all fat and believe Spain is next to Mexico, all your movies are over the top, you have no history or culture and hey! don't you like our ham and the Spanish omelette? A sense of humor and patience is one thing but if you have to go through this 100, 500, 1000 times, how do you how can you not feel bitter about it? I've now got all my language certifications and I feel like it's the only positive thing I'm taking away from this place.