I tend to agree with this; I don't feel comfortable with the "you can just not look" argument. On the other hand, I'm not sure where responses would go. "Respond in the vent thread" seems like it's almost certainly counterproductive. "Respond in the original thread the person was venting about" may be a bad choice, because the point of the vent thread posting was presumably to NOT put that material there. Maybe an argument island thing? Maybe your own vent thread? I'm not sure. I think my default would be to suggest argument island, because that way they're pretty clearly invited to come engage with you if they want, while other people are pretty clearly disinvited from dogpiling.