I don't support this so-called "Bitcoin classic", this idea seems completely idiotic for me. But this is just an opinion and such issues should be resolved by vote. DDoS attacks, ad hominem statements or whatever similar tactics are no better than assassination of opposition figures in the real life. This kind of behaviour is childish and unconstructive.
The problem is - how do we vote?
The only decentralised method that exists today (that can't be easily Sybil attacked) is Bitcoin - but if we are not going to use Bitcoin to vote about Bitcoin then I think we have an unsolvable problem.