4. Not holding the door for the person behind you
If someone holds the door for you, it’s your job to grab it and hold it for the next person. Unfortunately, when we’re in a rush, many of us forget about this crucial etiquette rule, leaving the person who held the door for us initially to play de facto doorman for another 10 people before getting a break.
However, you also don’t want to hold the door open for someone who’s too far away, forcing that person to speed up to receive your kind gesture.