My take has been that most of these trolls are plants by some other party to make Monero look bad. They are annoying to Monero supporters, too -- not just you.
We can only speculate. It is a fact that there have been a lot of absurd cheerleader-type pro-Monero posts going up recently that we have nothing to do with. Usually they display a poor grasp of English grammar which ought to be a clue who is behind them, but in all honesty we just don't know. There may also be negative posts going up talking down about other coins, something we generally don't do (unless we have specific substantive criticisms). Treat them with similar skepticism.