When it comes to synonyms for the term "sarcastic rant," there are several options available. Some potential candidates include "acerbic tirade," "caustic diatribe," "sardonic diatribe," "ironic condemnation," and "mocking monologue." Each of these descriptors encompasses the idea of a scathing or biting criticism delivered in a satirical or mocking tone. Other synonyms might include "snarky soliloquy," "cynical spiel," or "facetious harangue," all of which imply a certain degree of discontent or frustration being expressed in a somewhat exaggerated or exaggeratedly humorous manner. Ultimately, the choice of synonym will depend on the intended connotations and nuances of the speaker's message, as well as the specific audience and context.