to my shame I have been called into the High School but have, never, never, ever said that 'boys should be boys'
One son was excluded for a couple of days, different occasion, another also excluded for a couple of days.
However, so were the perpetrators.
Anyhoo, back to the Q, some folk don't sleep at night wondering what they will find offensive the next day.
Humour is humour, some of it adult and should be kept away from little 'uns