Not really paranoid, no. It's possible. Sometimes, somebody sees an autistic person out and about, and we look odd enough to them that they are worried we may have dementia or a severe mental illness and have wandered away from a supervised situation. They call the police, and the police hang around. Sometimes they talk to you, sometimes not. Occasionally it will be because they think you are drunk or on drugs, and that can be a dangerous misunderstanding.
I've had campus safety called because I had a public meltdown, and then again when I freaked out during a fire drill. I didn't attack anyone either time; the first time I dropped my backpack and bolted; the second time I just became unresponsive and couldn't figure out how to interact, and had to pick somebody and follow them out of the building because the fire alarm overwhelmed me so much. I was vaguely aware that there was a cop-type person shadowing me, but I couldn't figure out what to do about it, so I just headed outside and waited until I could talk again. By the time I was back in action, the security guard was no longer there, probably having been told by someone else that I was autistic and would be fine (I was at the time with some friends who are also disabled and who know about my autism).
Don't worry too much about it; recovering disabled people who have gotten themselves into dangerous situations is part of a police officer's job. It doesn't mean the cop hates you, just that somebody saw you weren't quite NT and called them about it. Maybe they were worried about you, or maybe they were scared of you. It's just people being people. Best thing to do is get yourself a good mental list of things to do when a police officer talks to you, very simple things like staying still, making sure s/he can see you're not reaching for anything dangerous, and not throwing anything so s/he doesn't feel threatened; it can be a good idea to have a card or MedicAlert bracelet that explains that you're autistic and you're okay on your own, but you might look odd and may not be able to talk right away, or whatever is relevant for you. You want to make sure that the police officer knows that you are not a threat and not in any kind of danger; you're just disabled, and people often don't know what to make of you. When you plan, assume that the police have been called because you are in serious overload or have had a meltdown, and you can't count on having your high-level skills available. So make the plans simple and easy to remember and follow.