It does seem like the concern trolls have very quickly moved on from repeating that Biden is too old ad nauseum to Harris convicted too many criminals.
I think the best thing anyone can do in this day and age is educate themselves on trolling/astroturfing tactics. Once you do they stand out and it makes their goal of dividing and astroturfing significantly more difficult. It also makes them waste their time if no one takes their bait, which is good for everyone.