>>105372463This humanization is what causes their relationship to tank in the eyes of the second crowd, because as she becomes more "normal", Star and Mewni become more fantastic. Sure, Star could use magic at the very start of the show, and there were monsters to fight and dimensions to explore, but despite their fantastic nature, they were real, physical, and definite. Jackie was more ephemeral, like a star in the sky that you can see, but could never touch.
Jackie was the opposite of Star in this second viewpoint, and that's why this second audience hates what happened to Jackie because they believe she didn't deserve to be a character that only existed for plot development. When Star confessed to Marco and you see Jackie finally lose her chill, they were expecting a reaction from her. They were expecting Jackie to finally act like a grade-A bitch and complain about Star to Marco.
But that didn't happen.
It was that failure in writing, making Jackie become a more relatable character, making her finally appear fallible, only for her to be the sweetest, most-caring, most-understanding waifu who would rather let Marco be happy than force him to do what he doesn't believe he wants to do that made it agonizing to watch Sophomore Slump. It was only compounded by Star's awful behavior towards Marco as S3 progressed, from making him give up spending time with Hekapoo, forcing him into a squireship, putting him into a position to make her cheat on her boyfriend and then pointing the finger at him for being at fault, and a plethora of other horrible missteps.
That's why the second camp is so angry. The show finally made girls seem genuinely normal, that they're relatable and funny and understanding once you get to know them and they get to know you, that there's really no harm in just saying "hello", only to immediately do a 180 and say, "You will never find a girl like Jackie because she doesn't exist, and Star is how women really are."