What is social learning theory?

Also known as social-cognitive theory, it is a perspective that emphasizes the roles played by both cognitive factors and environmental factors in determining behavior.

However, it is not limited to Albert Bandura.

Perhaps what you are referring to is the Bandura's observational learning -- which is imitating the behavior of adults or figures on television, usually by children, who are more prone to learning aggressive actions than positive actions by watching 'models' -- people whom they are mimicking.