My personal opinion is that anyone who hates Bitcoin doesn't really understand it or they're jealous of the early adopters who got rich while playing with this funny Internet money thing. It would be easy to say to just ignore them, but then we'd be taking the chance that they have influence with government policy makers.
Yeah and I also think that they are the people who bought high and got panic when price fell extremely and gone through huge looses and now they want that everyone should follow them.