Honestly, if it were written in an ironic tone, it probably wouldn't have that much of a difference, despite the person being both sarcastic, and ironic. The meaning of the passage wouldn't change much. It wouldn't affect the theme at all.
This is just an opinion, please give your own opinion! if you are doing a test, paper, or just a piece of sample work, then do NOT copy my answer. Plagiarising is wrong.