WATCH: How not to treat Starbucks patrons

According to reports the incident happened in Queens, New York City and it's not clear exactly why the manager launched an attack on the woman.

The video was posted on the Starbuck Facebook page and quickly went viral.

Channel 4 reports that the woman placed an order for a Frappuccino at the store and was pulling up the Starbucks app on her phone to pay.

The Starbucks employee asked her name for her order -- but Chen said she didn't hear her.

That's when the worker began shouting at her, Chen said. 

The manager even accused the patron of stealing after she took a straw from the counter.

Some of the other customers decided to take part in the quarrel to try and calm the manager down. 

- Channel 4