Not everyone hates them
"If you think everyone hates the police then you are with the wrong people."
I don't think it's hatred of the police, that is too strong of a term certainly.
But at the same time, I don't know anyone who really thinks they are doing a good job either at the day to day community policing side of things. Where are the patrols around my community? the only place I even see a PCSO is walking to and from the station (within about 500 meters), I've never seen a real copper once - presumably the PCSOs are walking around town but I never ever see them - hardly high profile policing.
While at the same time, they seem to have an endless budget for targetting speeding (which sometimes I agree with but sometimes it just feels like an easy target), kettling of legitimate lawful protests (which I've always felt the goal of which is to deter future protest) and running DNA databases which it seems like they are just itching to get your details onto.
I know that some of that is a little unfair, the community policing doesn't run the traffic cameras or do the kettling or the DNA database, but the service as a whole, at a national level seems to have it's budgets the wrong way round.
It's at the point where unless it's a serious crime (actual threat of harm to someone) then I wouldn't bother reporting anything to the police because I know from past experience that it's a waste of my time.
Ironically, the sort of support that gets withdrawn by the public is exactly the support needed to help improve the service (if the police were interested in providing that service).
It's self-harming cycle - the police get less support so don't do the sort of things the community really care about less because of a lack of information from the community. Who see the police aren't doing the things they care about so stop talking to the police.
As mentioned further up in the comments, by the time this cycle really gets noticed, it's too late, you already have a generation who think at best the police are ineffective and at worse out to get you (See Traffic Speeds and DNA DB)