I agree, but there is a balance. I spend a huge amount of time trying to answer points raised and this is great when points are actually quizzical and intrusive into the tech. Its hard to encourage somebody to win a race or competition by using slander or foul language and asking them to die (all in caps).
So with limited time I think we need to be as encouraging as possible in finding answers. That is all Engineers and innovators do, find answers. Doing so in a sea of hostility is very harmful. So yes critique and debate by all means is to be encouraged, improper language and insults in my opinion should be quashed. It would not happen in person I am 100% sure of that.
I for one would welcome all efforts to ensure we have critique, debate and morality with a helpful dose of scepticism where appropriate.