That woman had no right to do that. It's taken from a show called Dadgiri (which means bullying in Hindi). This actress thought that she had the right to slap someone just because he was someone who got paid very less and of lesser value to the business.
It's not that simple. In India, the societal perception of people with different statuses is very different. Had it happened between people of the same status, you might have a point. If the difference is large, the insult is much larger.