Poirot, the one thing that has tripped up trolls in the past here is the time line. You say you and your son have had some medical issues recently. Now if you posted that your son was getting sick; next day in ER; later that day having surgery to remove a brain tumor; then next day in a different thread, your son had an argument with his best friend. Someone posts, "Do you have 2 sons, because your son just had surgery?" Oh, he was discharged, and the friend came over to see how he was doing. I remember one troll in particular where 3 days couldn't hold all the happenings that occurred to her in one day.
Another giveaway is the troll has interesting stories, and the killer is that there is always a punchline: things get wrapped up in a neat package, the rude person is shamed or punished in some way, and the troll is revealed as a hero. Now occasionally that does happen in real life, but most of the time there is no ending.