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One myth that needs to be dispelled is that women are the weaker sex. My fight class teacher was a woman, and she was, and still is, quite capable of beating most men to a pulp. She's not a giant or a bodybuilder, she's just fit and trained. If you know how to fight, you don't even need the fit part. For example, one quick jab to a person's throat will incapacitate them long enough for you to attack them further, and so on and so on.
If we can get past that sexist nonsense about women being the weaker sex, we can get to the underlying issue, which is that is it never okay to batter someone, regardless of the gender of the attacker or victim. It's an immoral and criminal act, period.