There is a pretty big difference, actually, although these days the terms seem to be used interchangeably. An asshole is just someone who you really don’t like. A troll is someone who posts outrageous things that nobody could possibly believe are meant in earnest. Case in point: this recent post from the “Men that refuse to take it up the butthole” thread.
This is classic troll. It’s all there: Pokemon character username, fractured grammar with implausible misspellings, and an autohomophobic sentiment so hackneyed that even Tosh.O is over it.
resting, by contrast, has posted mostly straightforward insults with the occasional sarcastic remark thrown in. These remarks are not trolling, since they are pretty obviously meant to be perceived as ironic. Perhaps he is guilty of some degree of textual opacity, but I see no reason to brand him a troll just by his posts in this thread.