To be clear, not talking about this community, obviously 😛.
What’s the point of writing down rules, if mods just do what they want? But I suppose that’s the risk you take when you call someone a liar in a small community; they might be a mod.
Edit: I’m not trying to say that mods suck, they perform a useful and often thankless job. Just that it can be difficult for small communities to get a healthy number of good mods, which can become a problem.
Calling someone a liar is absolutely and always an ad hominem, because it labels their character rather than pursuing their argument.
You can call their words lies and attack those words and their intent, but once you start labelling you are looking to subvert it and attack character by assuming malicious intent.
Which you’re free to assume, but that doesn’t excuse you from the fallacy.
I’m ok with that.
If someone repeatedly and probably tells untruths, and then doubles down when confronted with evidence, I’m ok making that leap to calling them a liar.
Sorry, but that’s crap. Questioning the credibility of a liar is not automatically fallacious reasoning or an ad hominem. Attacking their character instead of arguing against their points is an ad hominem fallacy. Pointing out the consistency of lies from a single source and then extrapolating out to question the validity of future statements of fact is rational, logical, and reasonable. It’s perfectly valid to label a liar when they repeatedly tell lies, as long as you can support the label by proving they are lying.