As evident by many bad reviews on sites like Yelp left by demanding and de-meaning customers who should be rated themselves rather than rating others. While, we should never engage people like these because essentially they are like Internet trolls.
Engaging with them is like adding fuel to the fire. However, some restaurant owners hate to see their staff treated so badly so they sometimes take matters into their own hands. That is exactly what happened below.
When one user left a bad review, the owner quickly checked in to put the customer in their place. Turns out, the customer was not at all right in this scenario.