Why do some females perpetuate outdated stereotypes by acting as if they're helpless if a male is nearby?

I consider it an insult to my gender when a female (particularly one with education and/or professional skills) suddenly becomes a simpering idiot, incapable of making even a simple decision, when there is a masculine presence.

From conversations with male friends, I’ve gathered that they much prefer women who can grab a ladder if they can’t reach something or can troubleshoot their own computer problems without resorting to the “save me” maiden mode.

Women: If we want equal pay and respect in the workplace, isn’t it time we all abandoned these manipulative techniques? Shouldn’t we discourage these behaviors?

Men: Aren’t you offended by the implication that you are too stupid to know when you’re being played?

Please note that I said some females, not all. But, the behavior of a few can hold us all back.