That only holds true if that is, in fact, what the arguer is arguing.

What's more likely, however? A Bayesian rationalist who is rationalizing on a well-known logical fallacy, and publicly announcing it? Or somebody who is irritated with you for damaging the reputation of your in-group or the terms of the debate?

[Edit] Or, to put it more deliberately - read the final paragraph. You're starting from the assumption that the arguer is doing just that. You're starting from the unfounded presumption that a tone argument is a dismissal of the argument.