A future career
Essentially, we would be lost without the assistance of grocery store staff. These individuals literally keep the world going by delivering food to your table, but that doesn’t keep them away from the haters.
It appears that on their day at work, this grocery store marketing member did not receive all of this rudeness, so they felt compelled to demonstrate it to Ellie. They also wanted to place her on their blacklist so she would never get a job there again.