I always counsel my clients not to interact with Internet trolls. It just adds fuel to the fire.
I doubt the police would want to become involved in this petty bickering, absent a threat of physical bodily harm that could be considered seriously - which I doubt this is.
The Troll could sue you for your comments, but I doubt he will want to put any money up front with a lawyer - so I doubt he will go this route.
Finally, as I said up top -- Don't interact with the Trolls - it only gives them more ways to attack you.
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I agree, you aren't doing yourself any favors by responding to him. Leave him alone and stop giving him what he wants.
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