How can I confidently insult a teacher?

might sound b!tch wannabe i'm not swear...
unless have be.

basically, i'm new germany (and can't speak well) , there's teacher in school absolutely detest. he's physics teacher , insulted me in front of whole class (in german, didn't understand) when had go in class hand him (and made whole class laugh @ me , made me fool , left knees trembling long afterwards , when asked girl me had said - pissed way , said him - told me not pay attention says , ignore him if did understand resulted me in wanting find out said more ever).

still don't know said , have no way of finding out if happens again, want strong enough respond. gave him death stare other day when saw him , looked uncomfortable , glanced @ me 3 times , looked ground , walked off made me feel good.

of can respond calmly teacher without gulping or choking on words or getting shaky limbs - how do it? please give me tips, i'm not rude person , maybe should forget it's want try , want confidence boost haha, speak in english because he'll understand.

suggestions?

(ps i'm sorry if bit confusing or anything, know, apologising in advance. , thanks! - in advance :p)

i might sound b!tch wannabe i'm not swear... unless have be. basically, i'm new germany (and can't speak well) , there's teacher in school absolutely detest. he's physics teacher , insulted me in front of whole class (in german, i...

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