Men, at one time even myself treat woman so bad sometimes (way too much). They need to be cherished. Remember, that it's someones daughter, sister, mother. It is hard to pin-point why women deserve to be treated better then men (most times), they just should. Respect is just part of it. Women have a magical way about them, whereas us guys are pretty generic as it pertains to everything!
Respect everyone if you can, if you can't, make an exception for a woman. Trust me, she's earned it!!! How? If you have to ask, then you have not spent enough time around women, and should try to remedy that.