Oddly, I didn't have this nerd problem in school that you guys seem to be having. I was the quiet kid that sat by himself, reading. I had someone once try to bully me and I actually fought back and never had a problem after that moment. Bullies only go after easy targets.
I was never really a nerd, just quiet. Nobody gets a pass to be stupid about movies they've seen, however, and if a multi-million dollar hollywood movie has been loudly excreted and rammed down your throat with the full force of Marvel, you have no excuse to not even know who the characters are.
Wouldn't' say I was a nerd as such (i was never clever enough to be one!), I liked sports at school, and I played for a couple of teams. Wasn't a complete loner then, and had quite a few friends of varying social level. Of course nowadays I'm just completely socially incompetent and have probably fallen towards the "dork" group.
I hate hearing people be so blatantly wrong, but unless I am in the conversation I won't correct them, I just laugh in my head, I also won't be a dick if I do correct people, unless it's something stupid like thinking gravity is a cleaning product etc.
I fear that if you actually struggle with this type of situation and Martyr's tip of the week was not the first logical process that came to you upon said situation, then you may already be doomed.
If it was still high school and there was time to branch out to the hidden nerds among the populous than you might have had a chance of gaining that useful social skill. Unfortunately as you age your patience dissipates and you find yourself almost unwilling to choose that option even in the event of it being your first logical thought.
It just feels so much better to ram the truth down someones throat than to sit back and pretend like you want to be in there company for longer than it takes for you to correct their failed thought process and maybe observe the fact that the idiot who didn't know the name of the "Hulk" most likely left his fly down from his recent excursion to the little boys room.
Granted these are co-workers, so hit the pub or local dive and rant about it to the bartender like all the other socially awkward members of society.