Well my experience of the police over the years has been dire, so I would agree with this. I know some are good and care, not all police, etc. But
- First experience. My mothers partner when she seperated from my dad was abusive. I came in from school when 15 and he was shouting in her face and threatening to 'teach her a lesson' (for what, who knows..). I called the police after getting my little brother and sister upstairs away from it all and telling them to lock their doors. Was told it would be 'about 20 mins' before anyone could come. I feared, honestly, he would have killed her by then. And yes, I know this was wrong also but I felt I had no choice. He hit her twice infront of me, she crumpled to the floor and this just kind of happened instinctively. I got a kitchen knife and basically held him against the wall with it until the police turned up...half an hour later. They told him to go home and not come to my mothers house again, and threatened me that they could lock me up for my actions and not to do it again, then threatened me with being arrested as I was really angry with the response and called them 'fucking useless bastards who won't' act til shes dead'. I didn't get arrested as I shut up for fear of arrest. That was it.
-Second experience. Same guy, stalking my mother for weeks. Police had no interst and said they could not act until he 'did something'. My mother pointed out he had already assaulted her, and they had seen the broken nose etc when they came and instead they threatened me for basically, keeping her safe! Kept stalking her, police still not interested. No action.
-Third experience. He turned up again, hit my mother multiple times. Police did turn up in minutes that time (possibly as they were afraid I wold actually stab the bastard this time). Asked him what was going on, he said domestic dispute, and they fucking left. Seriously. Rang again, came straight back, told him to go home. No action taken despite more bruises ad blood clearly visible.
-Fourth experience. Not my experience but along the same vein and I believe my mother when she tells me this as there is no reason for her actions (which I do agree were against the law also..) otherwise. He randomly turned up at a work party. Shouting, threatening, multiple witneses. Hit her, told her he was going to kill her, actually had a knife this time. Everyone apparently just looked shocked and noone intervened..so she ran, got in her car and drove home. He called the police immediately and told them she was driving when she had been drinking. They somehow managed to get to her before she got home and she was arrested. Not sure if mitigating circumstances would apply here, as she did drive over the limit but for fear of her life, and also just over the limit, not that that matters in reality. But..arrested, held for hours, then charged, loss of license, nothing done to him. AGAIN.
-Fifth experience, Same guy, again. Mother had moved on and not heard from him for a few months, was having a drink in the house with a male friend. He turned up, usual threats and hitting her, male friend overpowered him, possibly went overboard in violence but hoestly, it was well deserved I think. Finally, when the police appeared, they arrested male friend, but as the guy had hit him too, he was arrested! Finally! Once he hit a bloke.
Not sure what happened to him after that, purposely tried to forget him but male friend got a warning for violence as far as I remember, but we never heard from her abusive partner for years, so assume he did get locked up, though my mother was ever called to court oddly..
Experiences as an adult.
- Got my own house at 17 as it was possible then where its not really now. Few months after I moved in, creepy guy from up the road starts turning up at my door saying vile things, managed to get my number, also called with vile things often. Wuold shout stuff to me in street, infront of many people. Reported this, was againt old, unless he does something we can do nothing. A lot of women in the street I found out had had 'experiences' with him. He finally assaulted me when I was coming home drunk from a party. I called police, was questioned about why I was drunk at 17, why I was wearing the clothes I had on, told me to get inside and lock door and they fucking left. Thats it. Didn't even bother speaking to him so obviously blamed me. No crime.
-Creepy guy gained confidence. Turned up at my door and tried to force his way in. I fought him, and yes might have been OTT in aggression as I did end up breaking his nose, but in all honesty, I was terrified and 'reasonable force' when someones breaking in to assault you is...hard to stick to, or even think of at the time! Long story short. I got a record for assault. He got nothing.
-Same guy again, trying to kick my door down when I wouldnt answer door! Eventually broke window to get in. Police..will be there asap, no time frame 
Had a few male frends there though who restrained him. He hit one of them and broke his jaw. Eventually police turned up, and did arrest him. Again, once a bloke was hurt. Its hard not to be..well skeptical about the police and their want to protect women.
Have had a few other incidents with the police over the years, but each and every one of them, action was only taken either when a man was hurt, or when a woman was actually put in hospital (as my friend, was, 10 times calling police, useless, finally he nearly killed her and action was taken)
Father in laws car was stolen also, police told him to send in cctv footage (had cctv due to other incidents, lived in a rough place), then he never heard anything more despite clear pictures of the guy, called up and was told case closed!
I have absolutely zero faith the police would ever help me if I needed it, based on experiences spanning 20 years. But I also know, if I ever insulted/offended a man on twitter, there is a large chance they would turn up and arrest me.