Devil’s advocate: it’s a silly sign, but it’s also supposed to be a joke. And, like most jokes, there’s some truth behind the intent. Which is to say, obviously women have far more rights than guns (don’t think anyone doesn’t literally think that), what they’re trying to say is that they wish protecting women’s rights were as important to politicians as protecting “gun’s rights” (preventing gun control).
I still don’t agree with the premise that women’s rights are under attack in the United States.
Looks like over 3 million women disagree with you, and since they’re women, I trust they know the issue more than you do.