Next thing I know you're going to tell me peanut butter comes from peanuts!?

I want my money back!

Coconuts have fur and produce milk. Definitely a mammal

There's so much interesting history with plant-milks! For the west, almond milk has an especially long history. Here's an article about how there was a whole sensation around it in medieval Europe

Outside the west, soy milk has a very long history too.

A tofu broth (doufujiang) c. 1365 was used during the Mongol Yuan.[1][2] As doujiang, this drink remains a common watery form of soy milk in China, usually prepared from fresh soybeans. The compendium of Materia Medica, which was completed in 1578, also has an evaluation of soymilk. Its use increased during the Qing dynasty, apparently due to the discovery that gently heating doujiang for at least 90 minutes hydrolyzed or helped to break down its undesirable raffinose and stachyose, oligosaccharides, which can cause flatulence and digestive pain among lactose-intolerant adults.[14][15] By the 18th century, it was common enough that street vendors were hawking it;[16] in the 19th, it was also common to take a cup to tofu shops to get hot, fresh doujiang for breakfast. It was already often paired with youtiao, which was dipped into it.[17]

https://en.wikipedia.org/wiki/Soy_milk#History

Yep! It grew popular in medieval Europe periods during lent, but it ended up going far beyond that

But the sheer number of recipes from the Middle Ages that use almond milk, particularly those that combine it with (decidedly un-Lenten) meat, makes it clear that chefs came to regard it as a staple instead of just an alternative ingredient. Almonds turn up everywhere; in the first extant German cookbook, Das Buch von Guter Spise, dating to around 1350, almost a quarter of the recipes call for it.

[...]

Almond milk appeared in more overtly sweet dishes, too. A strawberry pudding could be made by soaking strawberries in wine, then grinding the mixture together with almond milk, sugar, and an assortment of spices, before boiling it all to thicken it.

[...]

Describing the diet of a pair of priests in 15th century Dorset in her book Food in Medieval Times, Professor Melitta Weiss Adamson, of the University of Western Ontario, writes that “almond milk must have played a significant role in their diet judging from the quantities of almonds bought.” She calls the late Medieval world’s appetite for almond milk not just a “love,” but an “addiction.”

https://www.atlasobscura.com/articles/almond-milk-obsession-origins-middle-ages

So do you make a big fuss about coconut milk?