Amen! It's so true. We choose what we put up with, and how we perceive things. We can change it at any time to something that suits us better.
I remember the first time I realized I didn't have to take someone's shit. I was 19 and arguing with a guy I was dating, who just happened to be the assistant manager at the bookstore where I worked. We were in the store, after hours, and I just had this realization hit me that I didn't have to stand for his shit. I told him so, and walked out of the store. It felt SO GOOD!
I now make a habit of not taking people's shit. But, if you're cool, I'll be your best friend. :)