Aside from the incredibly stupid racists throwing a fit over John Boyega playing a Stormtrooper in The Force Awakens, the other big complaint people have with the teaser is the new lightsaber being used by the Sith.
Internet laser sword experts came out of the woodwork to explain how the saber wasn’t practical, it could never work, and how JJ Abrams raped their childhood. It became a meme to bash the saber, all based on a short clip in an 88 second teaser of a movie that’s a year away. None of these geniuses know the origin of the saber (hint: it’s likely ancient), but that didn’t stop them from already deciding that the movie sucks due to it.
Enter Stephen Colbert. Although his super-conservative character is a persona, the guy is a true-blood geek who wears his love of Tolkien and Star Wars on his sleeve. On his first episode after the release of the teaser, he explains how everyone bashing the lightsaber are dumbasses: