What was aggravating the Hamelin cheese makers?

This is a tricky question, as it requires a bit of context. Are you referring to a specific story or event?

Here are some possible scenarios:

* The Pied Piper of Hamelin: In the famous legend, the townspeople of Hamelin were aggravated by rats who infested their homes and streets. They were desperate for a solution.

* A historical event: Are you asking about real-life cheese makers in Hamelin and a specific issue they faced? This would require more specific information.

* A fictional story: Perhaps you're referring to a story where cheesemakers are involved in a conflict. This could be about competition, a shortage of ingredients, or even a supernatural element.

Please provide more context or details about what you are asking so I can help you find a more accurate answer!