I want to help them with their research, so chapos of the "post hog" and pigpoopballs poster variety, what are your thoughts on counter trolling the fash and the terf? What techniques do you use to identify the foe when they try insidious entry into a community (e.g. how norse mythos got stolen by nazis but witch aesthetic is repelling them)? What level of engagement do you use? Do you know of any other academic writing on the topic?
Hide their posts without telling them. When they get no engagement, they'll move on.
Edit: By the way, it's hard to find out whether someone's a troll or just a 13-y-o who genuinely doesn't understand politics or anything yet. You can have a convo with them in private messages to figure it out before shadowbanning them.