A pinch of sarcasm is a subtle way of showing irony or mockery. If you want to express the same sentiment in other words, you can use phrases like a hint of sarcasm, a touch of irony, or a dash of mockery. These synonyms convey the same message but with a different tone and intensity. For a more severe tone, you can opt for terms like biting sarcasm, cutting irony, or caustic mockery. On the other hand, if you want to soften your words and make your point in a less aggressive way, you can use mild equivalents like gentle sarcasm, playful irony, or teasing mockery.