Having limited space or words can help us focus only on the most important things. When we say what we need to say in the most concise way possible, that writing often has more force. Its brevity leaves space for thought, in a way that long rants often don’t do (at least as well).
Brainstorm a list of ten societal ironies or hypocrisies that are getting you angry or that are moving you.
Then pick one of those, and capture it in 100 words or less. You might describe a scene that captures the irony, or use contrasting stats, or tell it in another way. But limit yourself, so that your writing is powerful.