I think the universal answer to that question is that people tend to hate what they don't understand. This is a well tested and far reaching concept. This is why we have religious wars, racisim, bigotry, and other things that don't compliment us as a species. Specifically in the martial arts, people tend to stick with what they have learned and put the potty mouth on everything else. I have had people tell me the Aikido doesn't work and when I press them, there are so many wrong ideas and misconcpetions, that I am not sure what they hate but it isn't Aikido.
My humble opinion
"Happiness is not a reaction, it's a decision." -- J.S. Kelley
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