How to do a "proper" Roman salute?

Hi there,

I love the Roman salute, especially when done by large crowds at once. Unfortunately, when I do it myself, I'm told it looks kind of "National Socialist" whatever that means. I've done it in front of the mirror and it does look perfectly Roman to me. Do you think I should wear something more specifically Roman to make it more obvious? Or is that "gay"? Mean people always find ways to put me down..