Where the head goes, the body follows.
This is one of the most important tenants of self-defense and it’s why every combatant, male or female, should keep their hair either short or bound to their heads in a braid that is so skin tight the fingers cannot seize it. The fighter who does not risks having the back of their head grabbed in the middle of combat by providing a decent, easily accessible grip for their opponent. Regardless of what television will tell you, the ponytail is not good enough.
The hair is a much easier target than attempting a headlock or grabbing behind the neck. Once an opponent has their target in their grasp and control of their head, they can take them almost anywhere they wish.
Your hair may be dead, but beneath the skin it is very much alive. Wrap your fingers in your own hair and pull, you’ll find it to be fairly painful, then, imagine the pull from the hands of someone who doesn’t care about your feelings or maybe your hair was pulled by someone when you were younger. It can hurt a great deal and pain has a way of locking us up when we are unprepared or it or when we haven’t been properly trained to deal with it.
It’s important to remember, no matter what folks say about hair pulling, that it is a real, acceptable, and commonly used tactic, especially against women. It will also work against men with hair long enough for a good grip. Honor has very little place in real world combat, remember that an advantage taken is an advantage gained and the only true imperative is survival.
Hair pulling is very common in fights among groups, such as in clubs, mobs, etc as a means of taking someone down. The best advice for when someone takes you or your character by the hair or by the head is to go with them, not politely, but in the same general direction by ramming sideways, forwards, or backwards in the direction of their grip and to keep going until they fall or are driven into a wall or another individual. This will keep you from being injured or having your hair yanked out, it will also save on the pain because it releases tension.