She saw it as Marco patronizing her and not realizing that her wand is a Game-Breaker.

Star wasn't necessarily in the right and Marco saved her, but she was upset that Marco didn't trust her to handle Tom on her own after she told him several times that she was going to the ball.

They have each other's back for a reason, and Star seems to have forgot about that this one episode.

That Marco came and crashed the lame party-something that Star would do on a regular basis-strikes me as off.

Star made a decision, but after that point when Tom has decided to clearly manipulate everything about the Underworld and the Blood Moon in order to have that dance, it comes across as majorly skeevy. For me, the lesson of 'Blood Moon Ball' falls short.However, they are still held in contempt despite their alliance with the Butterfly Kingdom because they are still considered monsters. As it turns out in 'Is Another Mystery', Demons are more of an exception.The Pony Heads and the Lucitors have been allies with the Butterflies for generations, so they don't count as 'Monsters' according to Queen Moon. The difference between 'Monsters' and 'Not-monsters' seems to be intentionally written to be arbitrary. She did pick up on it, and mentioned it in 'Starfari'.So the question is, what's their excuse? What's any different about their relationship then Eclipsa's? Is it because Wrathmelior is technically a demon? Either way, it's a huge double-standard that Star of all people should have picked up on by now especially, considering her current efforts to achieve justice for Eclipsa and stop the discrimination of monsters in favor of a peaceful co-existence. Also, in 'Club Snubbed', we see that the Lucitosrs are even good friends of the Butterflies, inviting them to the annual Silver Bell Ball, and approving of and even encouraging Star and Tom's relationship.

Their kingdom is a close ally of Mewni, despite the fact that their family is composed of Queen Wrathmelior, a giant demon that bears a heavy resemblance to Eclipsa's monster husband, Dave, her Mewman husband and King, and Tom, their hybrid son and Star's current boyfriend who she had previously dumped for his anger issues. However, enter the Lucitors, the ruling family of the underworld. As monsters are discriminated intensely by Mewni, she is considered a criminal and a disgrace to the Butterfly family, and was unjustly imprisoned in a magical crystal for possibly hundreds of years.

Eclipsa's entire backstory, one of the main arcs of the series' third season, revolves around her being imprisoned and demonized for leaving her Mewman husband and King in favor of her monster lover instead, and as the episode 'Monster Bash' revealed, giving birth to a Mewman-Monster hybrid, Meteora Butterfly, also known as Miss Heinous.

Conquer star vs the forces of evil