Why are the masculine part of a Lesbian relationship so Aggressive?

I have a question which i trully would apreciate an answer. I am a hetro-sexual male. i have nothing against people who are attracted to the same gender. if it makes you happy good for you. my question relates to a recent break up i had. My fiance at the time i found out had been cheating on me, i finished the relationship almost as soon as i found out. although she proclaimed it was nothing and wanted us to work it out. i am a believer in trust and honesty in a relationship and when that is gone whats the point in carrying on. so i ended it wished her well and went on with my life. met a lovely lady and began a new relationship. i was told that the person who she cheated on me with was a African American female. I just let it go and thought glad she is happy and to go with her heart. at least no marriage and children to be hurt, so i was going on with my life and then one day out of the blue this pretty large chubbish black lady walks up to me and punches me in the face. i was going to hit back as my first thought was it was a man. but when i noticed the femine features i could not, aalways taught to respect and never hit women or those weaker than myself. so i restrained again she tried to punch and kick me. i managed to block some but still caught some in the face and neck. i asked why are you doing this and who the hell she was! she then told me she was the one seeing my ex. and that my ex was upset that i had finished with her. and was no longer talking with her. I really thought this girl must have some serious mental health issues. i calmly explained my position and that it did not make any sence what she was doing. i had some blood now flowing doewn my face from the sharp nails. then another of her friends comes strolling over this time a guy and started making some racial remarks He was African American. he then tried to punch me when she started attacking again. my new girlfriend had just come out of the salon where she had been. so i could not let anything happen to her so i knocked out the black guy and while i was walking away to my girl someone yelled that they were coming at me again so i swung round and punched the attacker. it was the masculine lesbian. police arrived and questioned all of us. i was feeling so bad about raising my hand to a woman. police were told everything by bystanders and arrested her and the guy. i had alot of black and white people telling me not to feel bad. they said" walks,talks dresses and punches like a man trest it as a man. but to me its always going to be a woman. even in court she did not seem to see what she had done was wrong. outside court i had some lesbian and gay men who had come to court to support her after hearing everything in court telling me they were so sorry for me. but some the ones who dressed like males seemed to be on her side. and threatening my girlfriend and family. she was dumped by my ex and my ex is now with another woman who looks and dresses as a woman. and shes happy. i had a large piece of pipe come through my window. and saw them drive away. i could not hit them but i did send a few friends from the kickboxing centre i attend, all very large female kickboxers. needless to say i never saw another butch lesbian. but it still puzzels me to this day why are the manly ones so nuts.? and why do they in trying to be masculine let themselves go in appearance. trousers hanging, 30 years old and trying to look and dress like a 19 year old gang member. its just strange peopel are peopel why dont they just see things as routinely as the rest of us?