TL;DR is fine, but please justify your concerns. Quick drops lead to heightened heart rate and the flight/fight response.
The thing is that the FUDders understand this; it's exactly why they're FUDding. They're trying to initiate, or at least perpetuate, a dump for their own purposes (i.e., so they can buy low) or to bolster another coin (i.e., if coin A is dumping, its competitor, coin B, might get a boost or at least look better by comparison). The irony is that the ones sounding like babies and spreading FUD may be among the more knowledgeable people in the cryptosphere. Perversely, FUDding is an art.
But consider: A FUDder will only FUD a project worth FUDding--one that offers a chance for personal gain, or that represents a real threat to competing coins. So take it as a positive sign. Effective FUDders know how to manipulate people's fears and herd them, like sheep, in the direction that benefits themselves. Don't be a sheep. Do your research, make your own decisions, and buy or sell when you think it's the right time
for you.