Same here. Like with most of his stories it's not necessarily the "nugget of truth" that needs to be disbelieved (ie that he was bullied) it's the extra layers of pignosis that should be questioned. So was he bullied? I believe so, but do I believe that he stood up for himself and put some kid in his place to waves of cheering from his "clique of outcasts who just didn't give a fuhck"? Fuck no.
DSP is the type of person, whether kid or adult, to only shit-talk from a distance or only have a comeback after the target has moved out of earshot.