<human>: obligatory this didn't happen today but a few months ago, reading another post just reminded me of this and i had to post.

backstory: i grew up in europe with a bit traditional parents who drilled in common norms and stuff. one of them holding the door open for the person behind you. i moved to a certain country in asia where things go a little bit different. 
walking out of the shopping mall there's these heavy big doors. being the nice person i am i look over my shoulder and see people behind me so while leaving i stretch out my arm to hold the door open, totally expecting the person behind me to do the same for the person behind that. but that person just ignores common courtesy and sneaks thru the now slowly closing door which hits the person behind that in the face. who prompty starts cussing and yelling at me (and anyone who lives in this country knows 'aunties' can yell very hard. i just leg it ..quickly...

Can you summarize the given text in a few sentences?
<bot>: hold open the door for the person behind me, who slips thru slamming the door in the face of the person behind that who blames me :(