The phrase "a source of derision" is correct and usable in written English.
It can be used to describe something that is ridiculed or mocked by others.
Example: "His outdated fashion sense became a source of derision among his peers."
Alternatives: "a target of mockery" or "an object of ridicule."
If she was a source of derision to some, she was held a hero by others.
In fact, I spent most of my adolescence attempting to keep it a secret from those who might use it as a source of derision.
Instead of expressing outrage at the Ford Motor Company for illegally dumping on and contaminating the land, much of the national media fixated on the consumption of squirrel as a source of derision.
Crocker was recruited in 1943 to design one of its most creative weapons—a military-grade stink bomb that could be distributed to resistance groups and used to make its target "a source of derision or contempt," according to declassified OSS files.
It should concern us that the American president is a source of global derision and national shame.
The music-centred platform, which helped launch Lily Allen to fame and attracted 100 million users at its 2007 peak, is seeking to climb out of the social network "graveyard" after years of being a source of digital derision.
Meanwhile, lust is both a constant and a source of sad derision (as in the many sex-doll photos in which Sherman appears), somehow inseparable from the theme of physical breakdown (as in photos of doll parts as sexualized ruins).
Often in the modern era, recognition of the power of story has diminished, or has become a source of explicit derision--the notion that something is "a myth," or that someone is "a dreamer". But in reality, story and myth allow us to imagine what might be, to aspire to seemingly impossible heights, and to conceptually connect past and present human experiences.
The appointment was looked on as ridiculous, and his birthday odes were a continual source of derision.
One of the darlings of the early vegetarian movement (particularly in its even sadder form, the cutlet), it was on the menu at John Harvey Kellogg's Battle Creek Sanitarium [sic], and has since become the default Sunday option for vegetarians – and a default source of derision for everyone else.
New Jersey, in the shadow of both New York and Pennsylvania, has long been a source of mirth and derision.
