OK, as long as we are being honest here about line cutting. How about when someone asks if they can cut in front of you. Are you ALLOWED to?
Shouldn’t that person have to start at the back of the line and ask every single person in line if he can cut ahead? Because if he only asks you because he knows you and you are in the middle of the line, how can you possibly be giving permission for everyone behind you? And if you don’t get permission from everyone behind you, you are making them wait longer, etc. So for any instance, whether it is standing at the washing station at a simcha or in the lunchroom or waiting on a grocery line, isn’t then just as wrong to allow someone to cut ahead of you?