As incredibly nerdtastic as it sounds, medieval martial arts is a real martial art... so yea... a fatty from the ren faire (if he actually studied fencing and/or swordfighting) would total these guys. And, man, that would be a 10 star video.
Real Klingons don't wear hockey masks and bike helmets while in battle. Back in my day, Trekkies were honorable, and they didn't leave the house without the most authentic costume possible! Kids these days...
It's tempting to say, "Yeah, these guys probably got beat up in school a lot," but they didn't. This is what happens when you stop letting kids get beat up. This is behavior that can only flourish in the absence of shame.