Here is a Cultural Literacy worksheet on the idiom “Have an ax to grind.” This seems like a term that users of social media ought to have at their disposal–you know? But this is also a term used often in educated and even scholarly discourse to describe tendentiousness in inquiry.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.