...what? It's not a claim to be falsified, it's a hyperbolic metaphor. I don't particularly like it either as it's been thrown around so much as to have lost much of its meaning (like "gaslighting", "gatekeeping", "narcissistic", etc.) but it's absolutely a thing. If you call a coworker who doesn't perform while falsely accusing you of incompetence in public Slack channels "toxic" then everybody knows exactly what you mean.