Because what they said is word for word what some people unironically believe.

It's not a joke. People are that stupid.

It's why we have /s they didn't use it so they are serious. That's how this works. If you pretend to be a act like a retarded monkey, say things a retarded monkey would say, and you don't tell people you were joking when there is no physical way to tell otherwise.

People assume you are in fact. A retarded monkey.

I hope they are joking. But I literally have no way to tell.