Teachers are scared of being hypnotised
The high-pitched noise they make attracts too many dogs!
This is rubbish - everyone knows you can never have TOO many dogs!!
They could form tornadoes
Which could make lunch messier than usual!
Too many spinners in one place could open a portal to the FIDGET REALM!!
Really though, the main reason is jealousy!
Teachers can't use fidget spinners because of their MASSIVE CLUMSY ADULT HANDS!!