Why are feminists so angry?

The majority of feminists i have had the pleasure (or more like displeasure) of getting to speak with always seem so angry and uptight. I have had even worse experiences with feminist people on yahoo answers, especially in this category. They seem to always be on the prowl for anything slightly ist, or anything a showing inequality to women. Worse, they always reply in rude manors, always degrading either the asker, or the male race. Why is that? Have feminists had bad experiences with men, and therefore hate them enough to pronounce themselves part of feminism. Some clarification would be greatly appreciated. Please no rude answers, and if you are a feminist, why?