Kind of weird how both the Adventure Time show and the comic have competant women doing impressive or practical things, and the main characters berating them for not being very impressive or “cool”.
Like Finn and Jake saying Marceline wasn’t hacking properly as the screen wasn’t projecting onto her face and stuff. Or them saying that she wasn’t holding her bass properly, despite her claim that her way allows better finger action.
You have just isolated what would be colloquially refered to as a running gag. These are not weird but actually quite common in cartoons or other comedic media.
Aren’t those meant to be funny?
Your mileage may vary, but anyway, Jake and Finn are the but of those jokes.