Most people think programmers are nerdy guys with glasses while programming was initially started by all women. amirite?

I can't comprehend what you mean by this. I think it means that women caused the stereotype, but that doesn't make much sense, the fact it was all of them confessed me more, and the grammar doesn't help.
I'm really trying to understand but I'm drawing a blank.

This is actual propaganda from a wall at a feminist meeting