My chickens never got mean, but I did find that there was a "teenage" time of a couple of weeks where they really got anxious about human contact. If I recall it was roughly a 2 week period about a month or so before they started to lay. Once they started squatting and getting close to lay they reverted back to their old selves. Not cuddly like some folks get, but tolerant of me picking them up and touching them while they were getting treats.
On the other hand, they never launched themselves at anything.. So I'm not sure if it's the same thing... However the timing seems about right with yours.
On the other hand, they never launched themselves at anything.. So I'm not sure if it's the same thing... However the timing seems about right with yours.

