Wow. Alic, I am so sorry that you had to go through all this. Your answer is very emotional, and you have plenty of reasons to react like that.
I've been in the past through a situation similar to the one described here. I never had to beg for my life like you had to but neither does the original poster. Even the teacher was against me - it was not an Aikido class -, because of some distorted information having been past down on him. I found that if I left, everybody would remember me according to this incorrect information, so I stayed and looked at everybody in the eyes. It took a fair amount of time, but one fine day, someone started to wonder if something was wrong somewhere.
The original poster is not apparently worried for his life, and I do not think that his particular situation demands such an aggressive reaction. If he does react like you suggest, he might very will find himself with a big bully label on his forehead.