I guess that comes from the view that a 'hybrid' is neither one thing nor the other and therefore not as good as either. Thinking of hybrids as 'designer breeds' rather than 'mongrels' might help to dispel such ideas.
I agree, and to be honest if a bike is an out and out 'Thoroughbred' like a full-sus DH bike or a feather-light road bike with paper-thin clearances, then it's probably not going to fit with what you want to do with it most of the time IMHO.
For touring I think hybrids are fine. The difference between my tourer and hybrid is mainly the type of bars really. I've toured on both, and though I prefer the tourer as I like drops and it's a steel frame, I wouldn't have any qualms about touring on the hybrid again.