There is difference in accepting what CPC says about Tibet and Arunachal.
Let me explain it to you with an example (if you are willing to listen)
Suppose a person comes to a police station accusing another person of snatching his bag then automatically what the person says does not become true. The other person may/may not have taken his bag.
This is the case of China accusing India of taking Arunachal. The accuser need not always be true nor the accused had really committed the crime
Coming to case of Tibet, when the same person again after some days comes to the police and withdraws his complaint to the police saying that the other person did not take his bag and he had got it back, then the police will believe him and take back the complaint. There is nothing to prove here.
This is the case of China praising India on Tibet. When the opposite party itself is saying "Look guys you have done a great in Tibet and thanks for it" there is no reason in doubting it. Right ?
Now coming again to the question -
Has China ever accused India of trying to snatch away Tibet or has Chinese once, atleast once, traced a plot back to India.
Believe it or not we use slurs all the while in India. No state is spared and people from every region have their own nicknames.
I think you guys are a bit uptight. Need to loosen up a bit.