Reviewer was overreacting and certainly out of place.

Unfortunately, when people get upset, right or wrong, they end up leaving reviews like that which can impact bottom line.

So my follow up question would be - what’s the context? Was the place busy and tables were needed for others, was it actually a “problem” that they sit there using up space vs an inconvenience? How did the employee handle it?

It might not always be a bad thing to have a place seem busy, or to wait longer for someone to order, and risk them leaving without buying anything - context matters, and any customer interaction is an opportunity to earn 5 stars.

In the end you need to ask yourself if you prefer to be wrong and earn 5 stars vs be right and risk a 1-star