Seeing as you're 15, that's what your profile says, you must have at least 10 years of schooling in your time, did it never occur to you in that 10 years, possibly 15 years of your life that you have never learned what Sarcasm or a Joke is... Apparently not.
Seeing as you're 16, as what your profile says, you must have atleast one more year of schooling than him, and maybe even the knowledge that really your stuffty input isn't needed at all, sarcasm or not?