First off what he said was not factually untrue. This very article proves his point.
Fact: There was an entire thread responding positively to fake content while voting down the few people who were able to see that the content was fake. The one man with a substantive reply was literally accused of not being "civil" when he did no such thing. This is 100% toxicity laced with false etiquette.
If you want to be unbiased you can't say things like something was factually untrue if there is a fact in the main article literally proving his point.
Really whether reddit is more toxic or HN is more toxic is up for debate. It's just different types of toxicity and there's evidence going in both directions. Don't be like that fool who in the main article.... every story and statement has multiple angles.