Are Mermaids white or black?

They're a fictional creature, so I don't get the deal when people made a fuss about Disney casting a Black woman as one.

Most marine mammals have white belly’s to confuse predators .

I have no idea. I've never seen a mermaid in person.

Who cares?
People get riled up. About dumb stuff

Give them any colour/s. In dreams.

Lilac...

White

Each Mediterranian culture has a mermaid, technically siren, myth, but none of them are white, they're more light to dark olive skinned.