I admit not reading every post. I never hit a woman and have never been hit by a woman.
If a man is being attacked by an aggressive female and he feels as though he may be injured in that attack, then by all means he has the legal right to defend himself.
Every person should have the right to meet violence with violence.
But there is a difference in being attacked by some 5'3" spazz and being attacked by Gabi Garcia, though.
Truthfully, I bet most would agree on when violence is justified, and when too much is too much, if it were looked at on a case by case basis. Hard to speak about this subject in general terms when there are so many variables.