Oh no. You're retarded.
In the Spell Book Star states that Earth isn't her first dimension and she's used to things being different, and just wanted to have fun. However, Marco, having a stick up his ass, got mad when she was trying to have fun, so she acted like she didn't understand Earth so he could calm down and have a reason to spend time with her by "teaching" her Earth culture. It's why in the Banamagic episode she knows how a bicycle works, then pretends to not know in the later episode Star Rides A Bike.
Also, Glossaryk's VA was accused of sexual harassment on another show, which he denied, but the harassment was made after S3 went into production. It didn't affect Glossy's character in S3, but it DID result in a change of voice actor, which the show tried to lampshade by Star pointing it out in Conquer.
Also, it WAS asinine that Star isn't "really a Butterfly" because it serves absolutely no function to the plot, other than to help with the idea that "anyone can be queen", which dramatically clashes with the idea that Star is a chosen person who can not only have the power to come back from death and rebuild the entire Magic Dimension by herself, but also with the idea that Star has a responsibility as a person in power to do the right thing for those below her. Furthermore, Star never addresses the conflict that Mewmans and monsters can't live in peace or be together, given the result of Meteora being a hybrid of both, and her being vicious. They don't even bring up "maybe she's only evil because of her experiences" for a nature vs. nurture conflict; all that S3 mention is Goodwell's statement that it "would be terrible if Mewmans and monsters mixed", and it presents Meteora as the result with no possible alternative within the show's context.
Also, Starco IS garbage. Star abuses the shit out of Marco, makes him give up everything he enjoys doing, demands more out of him, treats him like a slave, and he just accepts this and takes it.