Sounds more like relativism than nihilism. Relativism is extremely common in mainstream political and moral discourse, especially in mass media journalism. This often takes the form of "bothsidesism" or "false balance," particularly in political discourse. So often, the merits of
any claim (about politics, morality, scientific facts, even very basic claims about well-documented events that happened very recently, etc.) are judged by nothing except how strongly people appear to believe in them.
You see this a lot on Hacker News too, like when the discussion touches anything related to moderation, community standards/guidelines, censorship, fact-checking, etc. A particularly popular viewpoint around here seems to be that the government (or sometimes, any powerful corporation) cannot possibly be allowed to be involved in determining the validity of any claim, particularly if that claim is controversial, i.e. there are prominent people on both sides who appear to feel strongly about the claim.