Playful banter is one thing as most anons will take part in or anyone else but the energy behind some people are that of a sadisitc and sinister natural. Almost psycho/socio-pathic as they have no idea the boundaries of proper social interaction. IRL you can tell this is happening when their eyes look like "there is no one home"… when you call them out on this, especially in front of others, they will always reply with "I was just joking" even though no one is laughing.