This is a continuing annoyance. On our most recent flight last week (ONT-SEA) my wife tried 3 times to get up from her seat (2D) only to have someone from coach rush by her heading to the FC lav. I finally had enough and just stood in the aisle for her, blocking anyone else that might try and beat her to the punch again.
It always bugs the heck out of me - if you have a rule/policy, enforce it. If you don't want to enforce it, then get rid of the rule/policy.
Any FA FT'rs care to weigh in on this??