
I think there's a difference between being mean and a playful sarcastic statement like "omg you're the worst" within proper context but if you aren't already close with someone humor like that is not going to go over well and comes off as mean. Idk why it's so hard for men to be nice. Like if you like her act like it
It’s a metagame strategy. They challenge you and put you on the defensive so that you feel the need to defend and validate yourself to them. It tends to work on people with an egotistical or competitive personality and trap them in a conversation to win the challenger’s approval. It didn’t work on you because you’re a normal human being.
7 year olds don’t usually have the same level of emotional development and maturity that adults are expected to have, so to young children, all attention is good attention. They are mean to someone they like because being mean to someone is still giving their time and energy to that person. That’s why you often see kids misbehave when they feel ignored at home, because even getting in trouble with their parents still means being focused on by their parents rather than feeling invisible.