Did i somehow insult my teacher ?

It was a nice English class, until that thing happens.
I sit next to my colleague, my table is empty except my tea cup.
The teacher got in the class and started his computer. Nothing was wrong until he troubling with his computer, he couldn't start it.
Then he pointed at me and said : "Fix my computer", problem is i don't know how the *** i can start it because that computer system is complicate.
But I gave it a try anyway, the computer of course didn't work.
So i said to him : " lemme get the IT guy ".
"Probably the It guy". He said.
When thing's done.
He looked at me an said : " Someone got a brain after all ".
Please feel free to correct my grammar if i'm wrong.
My point is did I do something wrong to him to deserve that ??