Because in America, that statement is so heretical and antithetical to what the average American thinks America is, that most people probably wouldn't even be mad at you for saying it: They'd think you were legitimately unwell/insane.
It's on the same level as saying "I hate liberals and am not conservative".
Here's what I say: "I've worked for small and big businesses, and the only difference is that with a small business, you know the person who's fucking you over."