What is the motive behind peopel who always misinterpret what you say or do and make it look like you are?

worse than you actually are? Or if you say a ping remark that had been phrased wrong, people think that it looks serious? For an example, I said to a friend that I used to have more guy friends than girl friends at school. She interpreted it as me being some kind of . Another time I was insulted by someone's arrogant and belittling atittude towards me, so I responded in kind and called him an idiot. Then a friend saw this and interpreted as me being "rude" or "prejudiced and vain" when it was no such thing. What is with people coming to such bad conclusions for no reasons? Is it because my first impression tends to be negative that they interpret all of my actiosn as negative?