Isn’t the worst socialism still better than the best capitalism? Why try to destroy “revisionist” socialism when you have capitalism to destroy? Wouldn’t it be easier to fix a revisionist socialist country than trying to convince a capitalist one to be socialist?
There were definitely things that happened on both sides that exacerbated the issue. The Chinese were very upset for example when Khrushchev made a deal with the US to specifically try to stop China from getting a nuclear weapon, which they needed for their sovereignty. The Soviets not only pulled all joint research with China per US request but even burned all their research in order to try and prevent the Chinese from recovering it and building the bomb. This was a bit slap in the face to China and sewed the seeds for distrust. Mao’s response to Khrushchev were not very reasonable either, Mao once equated Khrushchev to Adolf Hitler which seems a bit ridiculous imo.