> Depending on your perceived relationship with the poster you may feel something yourself.
Exactly. And unless you have a bias toward agreement, or you are already spun up like the poster, a stranger's dissonant communication style is more likely to be alienating than persuasive.
And re: knowing one's audience, the consensus position seems to be that I do not, here and now. So I concede the issue, in this context at least! Alas. :)
Not every statement is to be boiled down to intellectual delivery devoid of emotion. We're expressly humans, not computers.
The idea that "Intelligent people resist emotional persuasion, or at least try to." is for the consumer to apply, when and how they like.
Communication with vulgarity is not to make you emotional but to succinctly communicate the emotion of the poster.
Depending on your perceived relationship with the poster you may feel something yourself.
Similarly, if you are not the desired audience for this comment, you are free to move along with no further thought.