It's rude to curse another people
Gary is shopping in the store when the cashier gives him back the wrong change.
Gary wants to get the right change back.
Gary tells the cashier that she gave him back the wrong change.
Gary curses at the cashier and calls her a bunch of names.
The manager comes to the register and gives Gary back the correct change.
The manager of the store kicks Gary out of the store and bans him for life.