Why do racist people say black people are monkeys or chimps???

I don't see the resemblence at all. Monkeys can't have curly hair. Their hair is always straight. Black people can only have curly hair. Monkeys have those aposable feet or whatever. Black people don't. Monkeys either have a greyish face or a peachish face. Black people are brown. The only thing I can think of that black people and monkeys have in common is they are both from africa. But monkeys are from other places too. And giraffes can only be found in africa so why aren't black people called giraffes? I don't get it. Why do people call black people monkeys?