And, by doing so, you’ve let both the offender and the police officer in question off the hook.
The police officer just wanted a quiet life (They are not all like that) and fobbed you off in an attempt to avoid the hassle of dealing with it properly.
The offender not only reacted badly in the first place, but then went on to intimidate the OP, in an attempt to avoid any consequences of their actions (Committing a further ‘offence’ in the process)
The more that people are allowed to get away with unacceptable behaviour, the more they will feel inclined to carry on that behaviour, and the more likely they are to do it to somebody else.
Well done to the OP for pushing for a resolution.