Why did David hate Mr. Creakle's school?

When David arrives at the school, he finds out that he has arrived during a break and the other boys are gone. David also learns that he must wear a sign on his back that says, "Take Care of Him. He Bites." He spends the week of vacation studying with Mr. Mell, being yelled at by the gate guard (a man with a wooden leg), and wondering what the other boys will do when they see his sign when they get back.

when he arrived school he found himself alone and no body is there . then he realised that he was sent to the school in the holiday time.
He wore a sign that says " watch out of him he bites " .
he studied with MR / Mell and he wondered what will happen when the boys see his sign .