Insults

After finishing The Vagina Monologues and thinking about the book I realized that there are so many insults incorporated with girls. For example with the name "twat", so many people use that as an insult as well as the word "pussy". These are both nicknames for a vagina, yet they are both used as insults towards people. It's interesting how a part of the female anatomy can also be used as an insult toward someone and it's totally acceptable and normal. And the best part is if someone does call you a pussy or a twat it's a huge insult. Yet, if you called someone a vagina they would be like "what, what does that even mean?".  Yet in reality it's the same exact thing.
There are many different names that are insults that all have to do things with woman. Another example of a really common one is douche or "douchebag". I don't even know how this started to become something normal to call someone but technically a douche is a cleaning product for a girl. Yet when someone (usually a guy) is being rude or annoying he is called a douche and is said to be acting "douchey". The fact that you can actually describe someone as being a douche is just interesting to me.  Someone can say, "Yea, I used to like him but now he's a complete douchebag" and everyone will understand what they mean. It never ceases to amaze me how many of words incorporated with woman have become insults and well known ones.
You can also call someone and girl and have that be offensive. Obviously if you call a guy a girl he will get offended but the reasoning behind calling him a girl intrigues me. Someone would call a guy a girl if he jumps when he sees a spider run across the room, or if he