It might also be that "in an ideal world nobody would be stupid enough," "an enormously stupid idea" and "most ridiculous bullshit in human history" aren't really arguments, and thus not really further the conversation.
That ignores the rest of the comment. So yes, if you ignore the comment as a whole, and choose to pick out specific parts of the comment, you can claim the entire comment worthless. But I disagree with that approach. With that approach, you've essentially become no better than someone who down votes someone for making a spelling mistake.
In my mind there's a huge difference between spelling _mistakes_, and _purposefully_ setting up a negative and insulting tone. There's no need to ignore the rest of the comment, when you think the overall language will do more harm than good.
I can accept that you find the language used to make a point not that important, but you should consider that not everyone might agree with that.
