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Cabin crew probably don't get why either...just enforce it, otherwise...I read the OP again, and of the transcript of the conversation is accurate then the FA was being difficult, a simple safety explanation would probably have sufficed. But it seems that more than one explanation was provided, and not with a great deal of civility. However as I wasn't there, don't know the OP or the FA involved, I'm not ready to take sides
if we alighted there was a risk the plane could tilt.
This is what happens when a 737 is incorrectly unloaded. When the forward door is only being used for disembarkation, the rear cargo hold must be emptied prior to the forward hold. https://www.youtube.com/watch?v=JLWxD0gY__A
There is often a thing under the front door on an air-bridge. I understood that adjusts the bridge height to prevent the door hitting it, if needed.
This is what happens when a 737 is incorrectly unloaded. When the forward door is only being used for disembarkation, the rear cargo hold must be emptied prior to the forward hold. https://www.youtube.com/watch?v=JLWxD0gY__A
When only the front door is used, passengers will constantly be moving forward, so I guess that helps with the plane not tipping back?