As human beings, we are naturally wired to build expectations for everything. When you say "I have no expectation" on something, what you are saying is just your expectation is low but it exists nonetheless.

With expectation comes satisfaction and disappointment. The two always go hand in hand. In order to avoid disappointment, I often deliberately keeps my own expectation fairly low. I try to manage others' expectation on me as well, by trying to keep it within the range I know I can deliver. Yet it's tough cause it can't always be achieved. Sometimes I just fail miserably because I can't satisfy them.

It's also very hard to fight some unreasonable expectations. I have to sit and wait before those expectation goes away. Meanwhile, what can I do? Hang in there before it's over. Or I can bend myself to satisfy them... But that way, I'm just not me any more.