I understand where you're coming from being an investor myself in a project that is currently misbehaving since last year. These new projects are the cause of their own bad mouthing. Before launching, they will promise heaven on earth and all sorts of things, only to run short of those promises and you start seeing a pattern develop. Besides you don't expect us to form the ostrich behavior of I don't care because some of us have scars to show from projects that ended up scamming us.
The thing is that people tend to speak against new projects which may rise in the business of cryptocurrency instead of supporting these new projects through encouragement. Sometimes they do this as a result of their past experience and I don't blame them for that.
Past experiences that tell them which one is crap or not. Because if you are already an old timer in a specific industry, you already know which one is heading to be a good one and which ones are deemed to fail. You can always see individuals who are badmouthing projects but in the end, it is all up to the project if they will be affected of those critics or not. If they have something to offer to the community, those bad words will not matter at all.
Your last statement caps it all up. If they have got a solid base, a truthful management(note:some come at you with half-truths to keep you hooked consistently) they will rise above any amount of words thrown at them.