I support a multipolar world order, in a large part because I believe that's what's best for developing/non-aligned countries. Since the US has been the sole superpower and has sought to establish itself as the sole global hegemon, using military aggression to expand its influence and power, it seems pretty natural to oppose it and support competition.
If the US and China are both major powers, then non-aligned countries have the freedom to choose who they do business with, which means they have some ability to bargain for a better deal. If the US or the West were the only game in town, then you'd have to accept whatever they offer, or be shut out of the global marketplace. Furthermore, many of the natural resources of poor countries remain in the hands of the Western powers that seized them through force during colonialism (Haiti is still paying reparations to France for freeing the slaves, for example). Ending this system of neocolonialism is a priority, and that requires an alternative economic bloc.
I don't believe that China invests abroad just out of the kindness of their hearts, however, China has expanded its power through peaceful economic development and trade. China has not been at war with anyone for decades, in contrast to the US which has waged (and is waging) multiple wars of aggression, for the sake of seizing resources. Furthermore, the West will sometimes just decide to steal the assets of poor countries that are invested in their banks, as the did with Venezuela. When has China done this?
Even if you dislike the Chinese system, I see it as a necessity that enabled other systems to survive. The West has a specific system that they want to impose on the entire world, and if you're the only country not doing that system, you're screwed. But China is a lot more flexible, and imposes fewer conditions on domestic policy. This in turn limits the ability of the West to impose their policies, because a country can always choose to walk.

You're right, I misremembered it. However there have been calls for France to repay the reparations which it still has not done, and Aristide was overthrown in a foreign-backed coup after calling for that.