What are examples of childish behaviour?
I know a 31 year old woman who laughed hysterically when a co-worker fell down a flight of stairs and when a client got stood up by her boss. This same woman is a gossipy bi**ch who laughs with this ridiculously high-pitched squeal. She even went so far as to shout something at my car as I passed her on the sidewalk after we had a disagreement about something. That’s about as childish as I’ve seen out of a grown woman!