Corrected entry: Sidney is talking with Stu and Tatum at the lockers when someone runs by wearing the Ghostface mask. She runs down the hall, bumping into Billy, then goes into the bathroom and meets the killer. We know it isn't Billy because we just saw him, but how would Stu get into the bathroom without passing by Billy and Sidney?
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Correction: It was made pretty clear that it was two other kids that ran through the hall. There is a scene with Henry Winkler (principal) who is expelling the two students due to the prank.
Lummie ★
Yes, and that scene happens before the killer shows up in the bathroom, so it can't be them. Sidney also says that she knew it was really "him", the real killer, and not a prankster, and there's no indication that the movie wants her to be wrong at that time.
Sammo ★
The "tell" is that the shot of Sidney running out of the restroom has a voiceover from a news reporter talking about pranksters dressed as the killer. Sidney is far from infallible (she even misidentified her mother's killer) and is vulnerable and being psychologically manipulated by Billy and Stu.
TonyPH
The biggest tell would be that he has no knife, but there's nothing prankster-like in that assault, if he tackled her like that he would have hurt her (and he's in the girls' bathroom too?). The newscast about the pranksters establishes that it's the authorities' version, but the dialogue I mentioned happens later, addresses exactly that, and she negates it. I agree that Sidney is not infallible, but the fact that she was wrong (by deliberate misdirection from the real culprit) about Cotton is a specific plot point, she was supposed to be wrong and Gale even picks up on the fact that she deep inside isn't sure about it anymore. Overall the bathroom scene is one of those scenes that don't quite add up but people enjoy making theories about them ("it was all in Sidney's mind", "it was Roman", etc).
Sammo ★
I agree this is one of the film's weaker moments, but I don't think it's just an accident. The high school section was rearranged from the script and a couple moments dropped, and I believe it was decided during editing to make the restroom scene more ambiguous (adding the "killer's" grunts that sound younger than any of the characters; moving the reporter's monologue to the end of this scene) to make up for an unfilmed scene where Sidney encountered two more masked impostors in the school.
TonyPH