I'm currently Rewatching the whole SU Series and I'm up to The Post Wanted Arc:
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And THIS moment.
And after going back over and over to the start of the argument, I have to say it:
CONNIE WAS STILL A BITCH.
So now that I've actually suffered through this episode again and still found no LEGIT reason for why she not only acted like a brat who didn't get her way, but didn't even apologize to Steven(who only wanted to make things right and had a breakdown over this girl), I can finally say that she's a brat without any issue.