So far China hasn't shown a penchant for destabilizing foreign countries for its own ends. Sure, they brutally oppress their own citizens but their foreign policy outside of border disputes has been non-interventionist.
You do realize that India and China have been locked in a bitter border dispute for decades, right? One that periodically results in casualties on both sides? The idea that China and India are going to meaningfully align can only come from wilful ignorance. Or perhaps the You are either with us or against us binary thinking has become pervasive.