GN is certainly "nice" these days; however, I used to ask my students to avoid using "nice" because it was over used and had connotations of blandness. I agree with myself! There is a tendency towards blandness at the moment, which is why GN seems "nice".
I do love GN, but when even a serious discussion is peppered with irrelevant and inane comments, it does annoy me.
I do think there is some robust debate, but agree that some people, when they find find their own opinions challenged, tend to take it personally, which is where the rancour over, say, The DM, occurs. Then the debate loses its focus and descends into personal in fighting, people become upset, and perhaps withdraw or leave.