To my experience, calling out an internet interlocutor for committing a formal logic fallacy only serves the purpose of shutting down conversation.
After all, formal logic fallacies apply to formal logic statements- but internet conversations are not carried out in the language of formal logic. They are carried out in natural language (natural English, most often). Therefore, formal logic rules do not apply. One might as well accuse an interlocutor that they have miscalculated the gradient of their comment.
We comment on the internet. We say what we think makes sense in the way we think it makes most sense to say it. We are not infallible logical machines that calculate the truth or falsity of logical statements by rigorous application of a set of rules of inference. We are not little lay philosophers trained in formal logic, engaged in rigorous debate. We sound clueless and pretentious when we try to sound as if we were.
We should learn to not take the name of logic in vain.