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I am sorry to hear this is happening. So many police departments act in this manner when people try to report alleged gang stalking. The problem with alleged gang stalking is that when so many individuals are participating and the victim cannot supply the reason anyone would be following them in this manner, the police cannot believe it is happening, no matter how real it might be.
The police officer should not be insulting you and patronizing you, he should be investigating and at least going out to interview some of the vehicle owners to find out the reason they are in the area at the same time as you. If the police are not doing so, you will have no recourse but to file a complaint against the officer with the department's internal affairs division and his watch commander. If they do not at least get an investigation started, I am afraid (as there is no legal duty for how police and if police investigate something) you would then have to move to the next step, which is hiring a private investigator to investigate these people following you around and put a report together that you can then bring to the District Attorney to review for criminal charges.
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