I work at a thrift store which will not be named for my own safety.
Every single morning we have a customer who is the very first person in the store. He also only leaves when the production team leaves. So that's a solid 7.5 hours that he's in the store. EVERY single day.

He spends his time harassing the production team as they bring out merchandise. He flings himself at them before they even stop in the ailse they're filling and starts rooting through merchandise like he's desperate to be the one to look at and touch every single item before it hits the shelves.

He grabs something of value and keeps it in his cart for a few hours and posts and ad for it on some site like Craigslist and puts it up for sale at a higher price than what we're offering. If it does get sold, he buys it himself. If it doesn't before the end of the day, he puts it back on the shelf. He stalks some of the employees around the store all day long and had to be told several times to stop harassing them. Everyone is uncomfortable around him but the managers are too chickenshit to tell him to leave because he is a customer and does occasionally buy things.

I genuinely believe people like this should be dragged into the street and beaten bloody.