People using that comment in an online discussion is simply stating that they have run out of things to say in favour of their own stated position - it's just another way to shut down polite discourse and make a run for the lowest common denominator tactics.
Of course, if they are using comments like that then they're not likely to realise what they are doing either (unless they're trolling).
As the old saying goes - 'youth is wasted on the young' :)
Biting the hand that feeds IT
