Food cart and unhealthy habits

At the Baseball on Sunday.
There was a Coffee cart run by a lady. Her son (about 12 years old) was with her.
Mum was sitting down, her son was making himself a drink, using the stainless steel milk jug.
He pours the contents into a cup then licks the spout of the jug. Does not wipe it clean. 😋
Mum does not see this and the jug is ready for the next customer.