If find sarcasm can be relatively easily misunderstood in choices if you’re not careful, and sometimes even then. (My sense of humour often runs into sarcasm as well.) If you can’t make it really obvious it’s sarcasm, you almost need to state it. (Like “you say sarcastically” or “you say rolling your eyes” etc.) Or the other thing I sometimes use is itallics to emphasize a particular word to try and make it clearer that the statement isn’t supposed to be taken literally (like “Oh, sure. Let’s just tell the police officer a shape shifting alien is strolling down main street. What could go wrong?”)
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