1. There was a complaint of an assault. Like somebody called the cops? Whether it was by somebody in your household or your next door neighbor hearing things through the wall, we'll come knock on your door any time of day.
2. Not wrong for protecting yourself. A battery though is a battery and say that was a good samaritan pulling you off and you elbowed him/her, then they can press charges against you. Would it stand up in court? Probably not. As far as the *** beating, based on your story I would say they're in the wrong but all I have to go off of is your word.
3. Disobey a cop? The only time that you can legally do that is during a consensual contact (where an officer just comes up to you just to contact you). They can say hi, you can say **** off, and then legally the cop has to leave. Now if they're contacting you because you fit the description of a burglar who just robbed a store down the street, then its a legal detention and you can't just walk away. As far as proving you're not lying the only real proof is evidence.
4. Really who doesn't lie? Not gonna lie......I've lied. After that, its the degree of your lie. Referencing the shooting of unarmed black people I can't speak for those officers. I can speculate but I really don't know. Fear maybe? They messed up and didn't know what to do? That's not a justification for any of those events by any means but I obviously can't speak for them. Some of those shoots were terrible like the Walter Scott shooting. Screw that officer. Really. Other shoots IMO, were justified like the Alfred Olongo one.
5. I get asked this frequently. And the perception of the man being the one handing out the abuse is because it normally is. I've arrested plenty of women though. It's all about the dominant aggressor. If you're walking away from a female and she punches you in the back of the head and you go back and knock her out, you're gonna be the dominant aggressor. If it was the other way around and you got knocked out by the female, then she would be the dominant aggressor. DV incidents are too dynamic. If there's no injuries its basically whoever comes up with the more elaborate story making the other person look like the more violent one. A lot of times one person doesn't want the other to get in trouble so they say nothing while the other person is spilling all the beans, even made up ones. In those cases my advice is don't hold back and tell it like it is.
6. How did you know he was a cop? If he was and you did swing, I hope he wouldn't have shot you. He could have arrested you but again, if its just like you're saying, theres also a penal code for "words likely to cause a violent reaction." 240 PC if I'm not mistaken.