used as a joke throughout the film [why this matters
], via the secret identities that the female protagonist is forced to assume: these are all cruel, diminishing stereotypes positing a fat middle-aged woman as most plausibly passing as a sad cat lady, a single mother, etc, and all with horrible dress sense. But there’s also a conscious (and funny) effort to push back against that: that it’s unfair, unkind, not representative, and ultimately just plain wrong.
A major theme underlying the action comedy (one that actually informs and strengthens the comedy) is that the work that women do to support men and make men look good in their jobs goes woefully unappreciated, and that men actively attempt to undermine women’s confidence in themselves. What’s more, the film suggests that men do this because they know they cannot do their work without that support, and that if their female support was withdrawn (because, say, the women simply start doing the same more prestigious jobs the men are doing, which they are perfectly capable of handling), the men will lose the power and privilege that had been exclusively theirs.