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A BBC article on 'The week that changed the world': How China prepared for Nixon, written by an individual who was a student in China at the time, recounts how certain changes were made concerning the type and level of rhetoric allowed, at least directly during the visit itself (emphasis mine).
I was 15 at the time, attending secondary school in Beijing. I don't remember much about the actual visit, and all the friends I have talked with also only have very faint memories.
But we all remember one thing, which is the general stance towards the American visitors that the government had stipulated: "Neither humble nor arrogant, neither cold nor hot."
The article also discusses instructions directly given to media outlets:
Yang Zhengquan, former chief of the Central Broadcasting Station, recalls the general guidance for media reporting being that there had been "no change regarding China's attitude to the USA".
Meaning, "we are still against them, but President Nixon is our guest, so we can't shout 'Down with Nixon' and 'Down with US Imperialists' to their face".
As a result, the "US imperialists" moniker would be changed to "USA" in radio and TV bulletins for the duration of Nixon's visit. Some anti-American content could still be produced but it should not be excessive.
So you can see there is evidence that subtle changes were in place to tone down the level of anti-US rhetoric at the time of the Nixon visit, definitely not to boost anti-US rhetoric as the question originally implied.