Reddit is plenty cancerous, depending on how you define that. Certainly in the sense that people aren't arguing in good faith, aren't actively engaging, but are just firing talking points or insults at one another... the sort of thing good moderation used to help limit so that the quality of discussion remained high.

I'd way rather read a good-faith, well written exploration into a controversial topic, than someone who toes the mainstream line of acceptable opinions entirely while being rude and belligerent.