Well although this might be on the political lines, it is very much a part of this topic, every one in the region knows how serious they are about the Taiwan issue, and the Tibet issue, and for that matter even other border issues with neighbors, and diplomatic moves centered on these things are nothing new, or surprising especially in the region surrounding China. Some response to the recent issues between USA and China should have been expected.There seems to be some fairly juvenille attitudes out there about this subject. You need to look at this from the Chinese point of view if you really are interested in understanding what this happened. As a westerner living in China I offer the following points.
1/ The number one policy preoccupation in China is the "reunification" of China. i.e. the bringing of Taiwan in the fold. Any action that works against this is going to have a big reaction. They consider selling weapon systems supplying a seperatist movement. (Much like the Dalai Lama fuss.)
2/ They point to the USA's attempts to usurp Canadian ownership of the North West Passage as a similiar example where the US is intefering with a soverign country to change the status quo for it's own ends.
3/ I spend a lot of time in the airspace between Hong Kong and Taiwan. Almost every flight I do has US military aircraft hovering around the airspace in the Taiwan Strait. Both Control centres constantly are calling on 121.5 warning these aircraft away from civilian airways. Given this, the Hainan Island incident and numerous other unknown examples of US snooping, little wonder the Chinese are pissed off. Imagine the reaction if Chinese military aircraft spending all day everyday withing 50 miles of JFK Airport.
4/ The Chinese see themselves as the up and coming superpower and will not be pushed around, just like the US feels. The have had a terribly exploited and violent history in the last 100 years, much of it due to foreign influence, and they do not want any more destabilising inteference in their internal affairs. (Obviously they consider Taiwan and the Strait internal).
5/ It is clear they are trying to send a message to the US. "This is our part of the world and you are here as our guests. Don't interfere with our internal affairs".
They know the US has become fatally weak in the last 7 years and they are taking advantage of it. It's hardly suprising and it's easy to understand their motives if you look at things from their point of view for a moment.
Your comments about the experience in the airspace around Taiwan Strait are very relevant.
Weather one accepts it or not China and the USA do not see eye to eye on a host of issues and their will be clear disagreements in the future which will result in these situations becoming more and more common, as you said China is going towards a more active role in this world.
Addressing Australia as Austria in front of Australians, now that is a mistake, this however is clearly some sort of a response to the recent events.