I say this as an ex teacher and with the best of intentions, if you’re forensically picking apart what a sense of humour is defined as, maybe working in a school is not for you.
Teens are strange, wonderful, frustrating & brilliant creatures. If you can do the job without being offended at the things they’ll throw at you, and in good humour, that’s a brilliant thing.
If your mouth forms into a cat’s arse at the smallest slight, in a school, you’re fucked.
Good humour isn’t gag telling, it could be being able to defuse a situation without escalating a conflict & making the situation a million times worse. Not taking what they say personally. And crucially, like with bears or lions, never show fear 😂
And a good sense of humour is most definitely not about excusing bullying behaviour with a, “But it was just a joke!”. Making a colleague (or teen) the butt of a joke isn’t humour, it’s being a bully.