My youngest son bites, my oldest doesn't and never has. He how ever gets bitten when he frustrates his little brother. Ollie bites only when hes super frustrated and doesn't know what else to do. I was horrified the 1st 100 times he bit, but its something he will grow out of. We encourage him to use his words and for his brother to listen. I don't know if hes bitten at kindy but hes come home with scratches on his face from arguments. I really think its a faze with young kids- as long as its only when frustrated not all the time.
My oldest son hasn't picked up biting so I don't think its something you learn, more an instinct thing LOL.