Nah, don't assume the worst whenever anyone brings up criticism. If the person goes the giant font/red colored scam text route, then yep, he's a troll/fuding. Someone bringing up reasonable concerns, that is fine, for all coins. You can usually tell the difference by persistence. If someone bashes a coin non-stop, for days/weeks, then either they are fuding, have an ulterior motive (wants to buy coins cheap), or is unstable... or all three. If it's someone just stating their case, even a couple of times, and seems sane... that is normal criticism.