ETA: Upon rereading, this feels pretty weasely and I don't stand by it, so I'd like to add this was my bad & I'm sorry for being overly literal. Ultimately it's as much my responsibility to understand the sarcasm as it is other people to make it clear to me. I feel this way when I'm misunderstood despite being fairly clear, so it's only fair that I apologize and accept responsibility when I am the one to misunderstand.

Looking deeper I see you're likely correct, but honestly I disclaim responsibility for misunderstandings caused by Poe's law when I'm on this end. I see this trip people up all the time, so I know it's not just me. I see the sincere version of this statement made, defended, and doubled down on regularly, so no, I can't reliably tell the difference without a sarcasm marker (/s). I admit this is a weakness on my part, but I don't really feel responsible for it.