It's embarrassing to storm out of somewhere.
Alexandra is at a lecture and the speaker is saying things that she does not agree with and make her uncomfortable.
Alexandra wants to get away from the lecture hall.
Alexandra slips out as quietly as possible during a pause in the lecture.
Alexandra abruptly stands up, loudly exits the room and lets the door slam behind her.
The others in the audience are able to continue to listen to the lecture.
The others in the lecture hall are disrupted and think Alexandra is rude.