As you work your way through various forums and comments pages on the internet you begin to see similar patterns emerge. Two that I have most recently encountered go along the following lines:
Type 1 - A new user posts a torrent of mindless drivel, usually under the pretext of being so sophisticated and above the grasp of the other forum members. The forum regulars then, quite rightly, deride the post for being an inane stream of nonsense. Then up pops the original spammers knight in shining armour, who points out to the forum regulars that they should stop being so snobbish and engage the spammer. The thread is then usually abandoned, as there was never coherent point to it in the first place.
Type 2 - The classic grammar/spelling attack. Now I have some sympathy with this as it is annoying when someone cannot be bothered to make their posts generally conform to some kind of comprehensible English, however this type of response is usually nitpicking and there are situations where posters are either very young or are afflicted by dyslexia and the like. The entire thread then degenerates into an argument about spelling, grammar and punctuation, which is not particularly interesting to anyone except pedants.
Type 1 really annoys me, but I could be prey to being involved in Type 2 as some people could really do with brushing up on their English. If anyone else has noticed threads with recurrent themes, post them here!