Gen Z friendships have entered their nickel-and-diming era

Getty Images; BI Some Gen Zers will Venmo-request you for half an avocado. Venmo and Zelle may have made bill-splitting math easier, but they haven't made etiquette clearer. An etiquette expert shared the best way to approach bill-splitting and handle friends who don't pay back. When Joanne Wang went out for dinner to celebrate her 24th birthday, she expected to split the meal evenly. She was spending the evening with a new friend, so she figured they would each pay for their own order. When…