These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Squirrel Girl
Alternate Character Interpretation: The theory has been made that her power is actually the ability to warp reality. This is why she is able to defeat such strong opponents; the "talking to squirrels" shtick is just what she chooses to live as.
Author's Saving Throw by way of Worf Had The Flu: Uatu the Watcher is present in the panel where Squirrel Girl had defeated Thanos just to clarify that that Thanos isn't a "robot, clone, or simulacrum". Then in another series, Thanos mentions that he can create clones of himself that even the Watcher cannot tell aren't him. And thenWord Of God states that that Thanos really wasn't a clone. All these were written by Dan Slott, making him pingpong against himself. It's not the first time he's has gone back and forth like that. Just look at the whole She-Hulk/Juggernaut thing.
Fanon Discontinuity: Some fans ignore the canonicity of most of Squirrel Girl's victories; recognizing them as the jokes they are.
Hype Backlash: Some people wouldn't be nearly so aggravated over all the "Squirrel Girl is awesome and can beat everybody" talk if it weren't repeated so constantly by so many of her fans.
There's also the fact that her explosive popularity means Marvel is starting to place her in other titles as well, though not to quite the same extent as Deadpool... yet. The fact that she apparently maintains her Plot Armor and ability to completely school more serious, more powerful, and more experienced superheroes outside of the comedy comics she was usually in is starting to generate even more backlash, considering it means she's transforming from a Parody Sue to just a plain Mary Sue.
Internet Backdraft: Any Squirrel Girl thread has the potential to blow up into a fight between people who think that anyone who would dare to take a comic seriously is an idiot and that superhero comics should be as goofy, carefree, and lighthearted as possible, and people who think the term "funny pages" should not apply to their Graphic Novels in any way, shape, or form and that the goofy bastards are seeking escapism without angst.
Memetic Badass: Pick a comic book character, any comic book character, even a team of comic book characters. Put them up against Squirrel Girl, and Squirrel Girl will almost universally be the accepted winner.