The original "idea" itself was itself sarcasm. Your parent was simply underscoring it. You just failed to identify the original sarcasm, and ended up confused a

The original "idea" itself was itself sarcasm. Your parent was simply underscoring it. You just failed to identify the original sarcasm, and ended up confused and a bit too serious about it all. It's just some obscure humor, no need to get worked up over it :)