Asher Palmer was kicked out of the Lang School for rolling up a piece of paper and treating it as a gun after a discussion about weapons with his dad, who served in the military during the Kuwait war.
In an email to staff members, Principal Micaela Bracamonte allegedly wrote that the first-year student "had a model for physically aggressive behavior in his immediate family."
Palmer's mother, Melina Spadone, told the New York Post she found that remark "offensive and inappropriate."
According to the school, Palmer threatened to kill a girl in a separate incident
"Asher is exactly the type of student Lang [School] is supposed to be serving. Why they did this doesn't make sense," Spadone said.
The school has recommended that Palmer be home-schooled next year, even though his parents have already paid almost $120,000 in tuition.