In this era, most teachers would have learnt about special needs but most of them would have thought of those with learning difficulties or physical disabilities.
There are many kids who may look like they have behavioural problems nowadays but they just be the ones who have high IQ and they are simply too bored with the routine lessons for regular kids.
Kids who are too intelligent would have special needs that require higher academic demands to satisfy their hungry minds.
When their minds are not satisfied, they may have difficulty concentrating as well as following instructions.
Teachers should investigate further before jumping into a conclusion when a student who may appear to be disrespectful and unable to follow the lessons.
By knowing the underlying problem, a better solution can be implemented.