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1) Ron's a douche clearly for opening the door, after leaving. His room or not, he knew a person was changing. Everyone in that room, regardless of sex, is someone she didn't ask to leave, so they are trusted. However, he just opened the door, barely even went past the door's threshold, but still a dick move, but he wasn't filming. The camera was still outside. So he was in the wrong for trying to scare them by opening the door.
He certainly wasn't trying to batter the door down. The chain lock broke, but that's just the fault of they cheap chain locks and how they are installed, not the result of any effort to break down a door.
2) Ron willingly left the room, when asked. We see the girl undressing, but the camera wasn't even in Ron's hand, who we just saw spray deodorant on himself, unless he's fucking telekinetic! Ron's only purpose to even go into the bathroom was to clear the toilet, so she could change in there, but when he steps out, she's already beginning to undress, which she did not inform anyone else in the room, at least in any loud manner that the camera could pick up. It's not until the camera is pointed at her, that she even freaks out and flips off the camera.