There is actually just as much freedom in everyday Chinese society as there is freedom in US society, in fact I would argue there is more of that in China, because here in US the PC/twitter police will make your life miserable if you are not careful about what you say.
And yes, you can actually openly criticize the Chinese government, and yes, you can openly discuss politics open on the street. You ONLY get in trouble if you literally try to organize efforts to destabilize the society or join groups that wants to overthrown the government etc...
The impression of China have no freedom you are getting is from your own "free media" who will take every single chance to bash China to make themselves look better.
Don't believe me? Go take a trip to China, airfare is really cheap these days.
This is not quite true. While China is no where near as bad as some may try to portray it but come on. More "freedoms" than in the US society? That's more conspiracy than anything else. Only US still allows citizens their "right" to arms. Right to protest 1% as silly as that may be. Right to hold ridiculous events and forms of expression that are clearly counter progress and totally based on unfounded conspiracy theories. China is pretty good today but every effort made in the right direction does not require any exaggeration. But yes, people can express their political opinions relatively openly now. It wasn't always the case.