I completely agree. There are a bunch of assumptions going on, which are driven by stereotypes that still tend to be used as standards in general. 
But putting in the same basket these two assumptions:

• that some careers give you a better set of tools (let’s put it that way) to contribute to a political conversation
• that a woman’s opinion is less valuable than a man’s

is a bit reckless I think. The latter is just ridiculous (gender has nothing to do with the value of an opinion), while the first leaves room for investigation, at the very least (because it is tied to other factors like exposure to different social, economic and/or political).

I’d love to hear a housekeeper or a social worker or a cook or anybody else (maybe more than a rich model to be honest) speak their mind and contribute at a political rally. But as they weren’t invited because they aren’t famous, Emily was because she is. She should be mad for that, too.