"Sarcasm" unfortunately has a negative connotation. It makes it sound like you were being spiteful. In practice, I interpreted the text as "There's a simple so

"Sarcasm" unfortunately has a negative connotation. It makes it sound like you were being spiteful. In practice, I interpreted the text as "There's a simple solution... but we cannot use it", which is a perfectly fine thing to say, in my opinion.