Seriously. If you’re not following these incredibly simple rules, as outlined in this Washington Post op-ed, then you’re intentionally using gender stereotypes to inflict damage (aka being sexist):

Don’t equate typically female characteristics or activities (baking, wearing high heels) with weakness.

Don’t — even, or maybe especially, if you’re a woman — equate toughness with manliness. At least not unless you think it’s acceptable for your opponent to tell you to behave like a lady.

Don’t use terms with sexist or racist overtones. If you, or someone in your campaign does, groveling works better than quibbling.

Read more about this at Writes Like She Talks and Women And Politics.