you'll get worms christmas story

It could be a story created for a particular family or community. Maybe there's a character in the story who is naughty during Christmas and as a result, there's a threat of 'getting worms' as a form of punishment or consequence in this fictional Christmas world. However, this is all just speculation without more details about the story.

I don't know the main plot as I've not heard of this story before. It could be about a child who is misbehaving during Christmas and is told they'll get worms as a warning.

Insect removal services were an increasingly popular option. As the pest control market grew, more and more families chose to hire professionals to remove pests. Cockroaches were one of the common pests. Due to their living habits and reproductive ability, it was difficult to eradicate them. Professional pest control specialists could quickly locate the places where pests were prevalent according to the characteristics of different cockroaches and customize a pest control plan that met the needs of customers. The exterminators would also tell customers how to maintain appropriate living habits and focus on maintaining hygiene to ensure that there were no cockroaches in the house all year round. On-site pest control services could provide long-term, safe, and worry-free pest control services to help families solve pest problems. Buggy Bye Bye, Origin-tracing Extermination, and other companies provided professional door-to-door extermination services. Their services included exterminating cockroaches, rats, and other pests. The professionals of these companies could solve the pest problem through on-site investigation and development of solutions, as well as provide after-sales services and guarantees. Buggy Bye Bye and other companies had already covered most of Shanghai. In general, the home pest control service was an effective solution to the problem of pests.

No, it's not. Ballad of Worms is a fictional creation, not based on real events.

Well, it depends on how it's presented. If it's a simple account of a man seeing what he thought were worms in his urine due to a regular medical issue like a parasitic infection, it may not be a horror story. But if it involves elements like the worms being part of a curse or a result of some dark magic, then it would be a horror story. Also, if the story is full of gory details about the worms wriggling out and the man's pain and fear, it would likely be a horror story.