The action of boycotting 2008 Olympic Games in Beijing is not against Chinese people, but against Chinese government's repression in 2008 Tibetan unrest. The boycotting is surely a politic issue, but refers to human rights problems in China.

Human rights should be respected for all Chinese people, including Tibetan people (Here we talk only about Tibetan human rights. We don't even discuss about Chinese government's legal right on Tibet. Tibet Independence is another issue).

Then what the hell is the relationship between the human rights and the press freedom?

I believe that all ours visions of the world are manipulated by media (intentionally or unintentionally).
At least in a country that has press freedom, we have the choice to take what we want to believe - that's all about it.
Human rights issue is just one of our visions, it can only be rooted on people's mentality where there is press freedom.